The Gulf, Mobile, and Ohio Passenger Terminal in Mobile, Alabama, which has Spanish influences with its cream walls and red clay tiles, was designed by P. Thornton Marye. It was completed in 1907 and has undergone restoration since passenger train service ceased in the 1950s.

The University of Alaska Museum of the North is home to numerous exhibits showcasing the native cultures, natural wonders, and wildlife of our nation's largest state. It's also a stylish refuge from the cold.

The Chapel of the Holy Cross in Sedona was completed in 1956, and it juts majestically from a red stone butte, some 200 feet above the ground.

The beautiful Thorncrown Chapel in Eureka Springs looks like an open-air structure, but it's actually a serene, glass-enclosed architectural marvel.

It was designed in 1960, but the Chemosphere still looks futuristic. It's a house with 2,200 square feet of space, perched atop a 30-foot concrete pole. And it's survived every major Californian earthquake in the San Fernando Valley since it was built.

Mesa Verde National Park, a UNESCO World Heritage Site, features some of the best-preserved prehistoric landscapes of the Ancestral Puebloan people. These ancient dwellings, where the Ancestral Puebloans once lived, were constructed on the sides of natural cliffs.

While most dwellings had only one to five rooms, the Cliff Palace, the largest known cliff dwelling in North America, had 150 rooms, 23 sacred meeting spaces, and housed about 100 people, according to the National Park Service.

The main feature of Grace Farms in New Canaan is a serpentine wooden pavilion that links glass-walled rooms, including a library, stage, tea room, and a gym with a full basketball court. Completed in 2015, it's open to the public for free.

The country's oldest state has some classic buildings that stand the test of time. Wilmington's Grand Opera House, built in 1871, is as classic as it gets.

The Salvador Dalí Museum in St. Petersburg is a fittingly unique tribute to the beloved master of surrealism. The museum boasts the largest collection of Dalí's work outside Europe.

This might not look much like other buildings in this list, but the Ocmulgee Mounds National Park's Earth Lodge dates back to the year 1015, per the National Park Service.

The lodge is a reconstructed council chamber of the native Mississippian culture. While the walls and ceiling were reconstructed in the late 1930s, the clay floor remains the same as the original, dating back over a thousand years.

ʻIolani Palace in Honolulu is the only royal palace on United States soil. David Kalākaua, the last reigning king of Hawaiʻi and the first monarch to travel around the world, was inspired by the European palaces he saw during his 1881 voyage.

The Dog Bark Park Inn in Cottonwood is a delightful piece of American kitsch. The bed and breakfast is shaped like two charming beagles.

Although there are between 5 and 6 million adherents to the Bahá'í Faith, there are only eight continental houses of worship worldwide. The one in Wilmette, Illinois, is the oldest still standing, and the only one in the United States.

When the West Baden Springs Hotel opened in 1902, it was billed as the Eighth Wonder of the World. While enjoying the view from inside the massive domed atrium — at one point the largest in the world — it's easy to see why.

Father Paul Dobberstein promised to build a shrine to the Virgin Mary as she helped cure his grave case of pneumonia. His resulting Grotto of the Redemption in West Bend is made of rocks, shells, fossils, and gems pressed into concrete. It's the size of a football field.

The Big Well in Greensburg is a museum that rests atop its titular main attraction: the largest hand-dug well in the world, spanning 32 feet in diameter and reaching a depth of 109 feet.

Churchill Downs, most famously the host of the Kentucky Derby, can hold 120,000 excited, sometimes rowdy, racing fans at max capacity.

The Pontalba Buildings, which make up two sides of New Orleans' Jackson Square, are emblematic of the French Quarter. Some of the residences on the upper floors are believed to be the oldest continuously rented apartments in the country.

The Portland Head Light — one of the state's many lighthouses — has been around since 1791. It was built under the directive of George Washington himself.

The American Visionary Art Museum in Baltimore showcases outsider art. All the works within its wonky exterior were made by inspired, self-taught creators.

Simmons Hall at MIT is the coolest dorm building in the US. It looks like a monstrous Tetris piece combined with underground caverns.

The museum, one of the oldest and largest dedicated to African American history, is a three-story building designed with influences of African and local Detroit architecture. The building features a stunning 55-foot-tall glass dome ceiling.

The Marjorie McNeely Conservatory at Saint Paul's Como Park was opened to the public in 1915 and features Japanese, Bonsai, and butterfly gardens, among others.

Designed by Frank Gehry — whose striking work also includes the Louis Vuitton Foundation in Paris, the Walt Disney Concert Hall in Los Angeles, and the Guggenheim Museum Bilbao in Spain — the curved metal pods, which house pottery at Biloxi's Ohr-O'Keefe Museum of Art, are meant to look as if they were "dancing with the trees," per the museum's website.

The parking garage at the Kansas City Library is called the Community Bookshelf. It displays the giant spines of 22 classic books that were suggested by Kansas City readers.

Construction started on the Montana State Capitol in 1896. The inside of the rotunda salutes four types of people central to the state's early history: a native American, an explorer, a gold miner, and a cowboy.

The Nebraska Capitol in Lincoln is one of the greatest state capitol buildings in the US. Built between 1922 and 1932, the building features artworks representing the development of law and the state of Nebraska.

The Ward Charcoal Ovens in Ely were built in the 1870s for silver mining.

The distinctive beehive-shaped Ward Charcoal Ovens in Ely were built for silver mining back in the 1870s, and they still look like nothing else on the landscape.

Built in 1902, the Mount Washington Hotel — today operating as the Omni Mount Washington Resort — is one of the last remaining grand hotels in the state, and is rumored to be haunted.

Nassau Hall is the oldest building at Princeton University, dating back to the 1750s. While it now houses the school's administrative offices, during the Revolutionary War it was occupied by both British and American forces and suffered damage during the battles.

Hundreds of years old, the Taos Pueblo is a multi-story complex built by Native Americans from the region. It looks like one big, molded piece, and it's still used as a residence.

The Empire State Building gets all the hype, but it's the Chrysler Building that's really the most magnificent skyscraper in New York City. The Art Deco-style building was the tallest in the world when it was built, but it was beaten out by — you guessed it — the Empire State Building just 11 months later.

North Carolina's Executive Mansion in Raleigh is the home of the governor.

Give it to North Carolina for having its most beautiful building designated as a civil landmark. The state's Executive Mansion in Raleigh is the home of the governor and a high-profile event venue that's open to public tours.

At the center of the North Dakota Heritage Center in Bismarck is a great glass cube flanked by two copper-colored wings. It's the home of the state's greatest treasures, including Native American historical artifacts and lots of dinosaur fossils.

The Longaberger Company, which makes baskets, made a building in Newark that perfectly matches its brand. The building was closed in 2016, and it has largely sat idle since.

Plans for the property have included a hotel, a coworking space, and, most recently, a mixed-use development, but it still has an unclear path for the future.

The First Americans Museum's 175,000-square-foot building in Oklahoma pays homage to the state's indigenous populations and their history. The design is inspired by the importance placed on the rising and setting sun by Native populations, with the Remembrance Walls being aligned with the sunrise.

The central half-dome is supported by 10 pillars of various stones, each representing a 10-mile stretch traveled by Native people during forced removal from their original homelands, according to the museum's website.

In 2009, Travel + Leisure famously called The Portland Building "one of the most hated buildings in America," and its reputation is split among architecture critics. But its shapes, strange geometric clashes of glass and stone, make it the weird building that Portland most deserves.

Frank Lloyd Wright's 1935 masterpiece Fallingwater remains Pennsylvania's greatest work of architecture. Water falls from each level of the building into the one below, perfectly integrating with the landscape.

Built as a summer residence for Cornelius Vanderbilt II, The Breakers mansion in Newport has 70 rooms across 138,300 square feet, making it one of the largest houses in the US and an icon of Gilded Age architecture.

In South Carolina, the International African American Museum stands on top of 18 13-foot pillars that keep the museum from touching the sacred ground on which it was built.

The museum is situated on the historic site of Gadsden's Wharf in Charleston's Cooper River, which was the last and most significant disembarkation point in North America for enslaved Africans during the transatlantic slave trade, per the US Civil Rights Trail website.

The walls of the Corn Palace in Mitchell are adorned with complex murals and art that's all been made out of, you guessed it, corn. The design changes every year.

Built in 1897 for the Tennessee Centennial Exposition — and then reconstructed between 1921 and 1930 — the Parthenon in Centennial Park is a full-sized replica of the Parthenon in Athens, Greece. Today, it's open to the public as an art museum.

Designed by renowned artist James Turrell, the "Twilight Epiphany" Skyspace in Houston is a performance space that makes you feel as though you've entered another dimension.

The Natural History Museum of Utah in Salt Lake City looks like it could have been carved out of the landscape. It was designed by Todd Schliemann of Ennead Architects.

The Old Round Church in Richmond is technically a 16-sided polygon, but it's still enough of a circle to lend credence to a rumor that it was built in that shape so that the Devil had no corners to hide in.

If they're done wrong, airports can be the most insufferable place to spend a few hours. But we have to admire Virginia's Dulles International Airport, which almost looks like a futuristic aircraft itself.

Forget the idea of a dusty old home for books nobody reads. The Seattle Central Library is a miracle of modern architecture.

The United States Capitol is such a mainstay of nightly news and political pop culture that it's easy to take for granted. It's nice to step back once in a while and take in the grandeur and historical significance of this government building that reflects on America's complicated past.

Construction on the Capitol began in September 1793, and much of the structure was built by enslaved workers working alongside free Black and white laborers, per the White House Historical Association. In 2012, a marker was added to the Capitol Visitor Center commemorating the unpaid labor of enslaved people who built the nation's Capitol.

The Palace of Gold is a majestic memorial shrine located in the Hare Krishna community of New Vrindaban.

The most striking feature of the Milwaukee Art Museum is the Burke Brise Soleil, a towering sunscreen with a 217-foot wingspan. It folds and unfolds twice a day.

This wacky-looking building is in the middle of the remote Wapiti Valley. In 1971, architect Francis Lee Smith started building the structure by hand as his and his family's home. After completing the first floor in 1973, he could not stop building. He died after falling from one of the balconies in 1992.

Even though my first leg wasn't on Delta One, I was still able to access the exclusive check-in and Delta One lounge at Los Angeles International Airport.

It was exactly the luxury I was looking for. I didn't have to bring my own suitcase inside, as a dedicated handler took it out of my Uber and brought it to the counter for me.

After checking in, I was whisked to a private security line with only two people ahead of me. The entire experience took a grand total of two minutes.

The Delta One lounge is reserved exclusively for Delta One passengers, so it's less crowded than Delta's more accessible Sky Club. The Delta One lounge is only available in Los Angeles, New York-JFK, Boston, and Seattle.

The one in Los Angeles is equipped with a range of amenities to enjoy before a long flight, including a full bar, plenty of food, an outdoor lounge, showers, and massage chairs. The chairs are a cool perk, but I didn't find them very soothing in practice; the ones in New York I like better.

There isn't a Delta One lounge in Minneapolis, but I could access the Delta Sky Club. This lounge was quite different — it was so crowded that I could barely find a seat, very loud, and the food options were limited. It wasn't the luxury I experienced before, so I left early for my gate.

The pod was very roomy, with the pièce de résistance being the lie-flat seat. Since I broke my ankle a decade ago, it's always better for me to be able to raise my legs on a long flight, and this was absolutely the way to go.

I appreciated that I could raise the lower portion of the seat while I was eating and then lower it fully into a bed when it was time to sleep.

The amenities mimicked a hotel, and the pre-flight service was top-tier: I enjoyed the small glass of Champagne served before takeoff, which was crisp, light, and refreshing.

After a full day of traveling, I was finally ready to experience the Delta One seat I'd meticulously scored — and it was nothing short of miraculous.

While this wasn't my first time in a Delta One seat, it was my first time in an individual pod with a door, thanks to the plane being one of Delta's newer Airbus A330-900neo aircraft (left photo). Its older Boeing 767s (right photo) and Boeing 757s I've flown on domestically don't have a door in Delta One.

The door was game-changing because it meant I could sleep without being bothered by the people around me. It just needs to be open for takeoff, landing, and meals, but otherwise, you can keep it closed.

Inside the pod were multiple amenities to get me through the flight, including a full bottle of water, charging ports, over-ear headphones, and a Missoni-branded pouch packed with flight essentials like comfy socks, an eye mask, hand cream, lip balm, a toothbrush and miniature Marvis toothpaste, and a pack of eye patches.

There was also a pouch with a pillow, comforter, and mattress pad to attach to the seat when it was time to sleep.

I am a famously bad sleeper, but once I lay down in my pod and shut the door, it was lights out. I slept for a solid seven hours and woke up very rested and ready to experience my first day in Rome, which I know I wouldn't have been able to do in economy class.

For me, the opportunity to truly get a full night's rest, especially with a 17-hour travel day and nine-hour time difference, was game-changing.

I wasn't expecting to use the in-flight entertainment system much, since I wanted to spend the majority of my 10 hours asleep. But since the meal took a while to arrive, I watched Dreamgirls to pass the time.

The TV was large, built into the seat, and could be controlled either directly from the TV or via a remote. There were hundreds of movies and TV shows to choose from.

While I appreciated the opportunity to select my inflight meal a few days before takeoff, I wasn't overly impressed by any of the options. I chose the salmon, but it was dry and overcooked.

I did like the shrimp appetizer and the tomato bisque, but I didn't feel like I had enough to eat overall since the main course wasn't appetizing. To be honest, it was actually worse than the meal I got in Delta Comfort on the way back, which was surprising.

Additionally, due to significant turbulence, the service was delayed. I had selected the coursed-out option rather than having everything brought out at once, but the flight attendants couldn't do that safely. There's not much you can do about the weather.

However, a choose-your-own-adventure ice cream cart was brought out right after the meal, and I loved that. I went for vanilla ice cream with nuts and cherry compote, which was delightful.

Thankfully, the breakfast was much better and helped fill me up before I landed. I chose Belgian waffles, which came with a croissant and yogurt with granola and fruit, and gobbled up every single bite.

Even though I had been traveling for close to 20 hours by the time I reached my hotel in Rome, this experience actually left me feeling revived and rejuvenated. This was the first transatlantic flight I've taken where I didn't need to take a nap as soon as I arrived.

Since I was only in Rome for a day and a half, I was able to go out and explore right after I dropped off my bags and took a quick shower, and make it to my reservation at one of the World's 50 Best bars that evening.

For me, absolutely. I know $900 isn't cheap, but since I originally used miles and this was the full cost of my flights to and from Rome, it was well worth it.

I had a dedicated check-in counter and security line, access to two lounges, meals (albeit some better than others), and a lie-flat seat in a pod with a closing door for a 10-hour flight.

I will say, though, that while I love Delta One, I wouldn't have paid the full price for this experience, which was about $4,000 one way — my fare limit for an experience like this taps out around $1,500.

I guess that means I'll stick to my upgrade strategy: meticulously checking for offers and crossing my fingers that another affordable one comes along.

Delta did not offer a comment.