A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

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

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

This was the first homestead registered after President Abraham Lincoln signed the Homestead Act into law.

A no-frills cinephile haven known for showing offbeat, underseen films.

The East Village tenement from the cover of Led Zeppelin’s 1975 album has a tea shop on the ground floor.

This cemetery holds the remains of an accused witch and the man that ensured her freedom.

From church to drug den nightclub to gym, few New York buildings have had as many diverse uses as this one

Red frames showcase remnants of one of New York's original subway stations.

Few other hotels can rival the grandeur of the Castle in the Rockies.

A controversial blue hoop has been puzzling freeway drivers since 2013.

This chimerical bridge/tunnel appears to dead end right into the sea.

A man's home is his castle.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

In the "Danish Capital of America," a replica of one of Copenhagen's most iconic buildings.

The simple log cabin of a famed loner and naturalist stands preserved as a symbol of the ultimate DIY lifestyle.

The largest public collection of roses in the United States.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

A home that witnessed Civil War combat on the Sunken Road has the battle scars to prove it.

The site of one of the deadliest skirmishes during the Battle of Fredricksburg.

The secret behind these nostalgic light fixtures: They're not as old as they may seem.