Years of archaeology, just chillin' by the water cooler.

The world's largest carnivore sanctuary is home to over 450 meat-eating rescues.

Lie in a hammock where George Washington stood.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

Walk the whole Mississippi River!

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

Legends surround this jagged rock formation in the New Mexico desert.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

Dig for your own trilobites in this goldmine of invertebrates.

These aggressively sustainable art homes look like something out of 1970's science fiction.

One of the oldest living oak trees in the Southeast.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

Quite simply the largest tree in the world (by volume).

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

The secret city built by the Manhattan Project.