A multi-storied adobe complex has been inhabited for more than a thousand years.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A museum dedicated to the alleged Roswell Incident.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A motel dedicated to Southwestern nostalgia.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

The prototype for all Nazi concentration camps.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

A reminder to choose water over wine since 1888.

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

The most confusing clock in New York.

A bit of retro transportation flair preserved in the world's largest department store.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Elevated freight railway turned wildly successful urban park.

This massive solar system model is sprawled out across Maine's suburban wilderness.

Turns out you can see the world without ever leaving Maine.