A luxurious doomsday bunker hidden beneath an unassuming Las Vegas home offers the best of subterranean suburbia.

This statue honoring the most decorated dog of World War I stands in a Connecticut park.

A long-forgotten Victorian swimming hole is still a fun spot for a dip.

A Route 66 filling station that was designed to resemble the Hagia Sophia, and is now the symbol of an arts district.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

Local stories say that if you drink from this well, you will return to Olympia.

Where Kevin Eastman and Peter Laird created their "heroes in a half shell" and founded Mirage Studios.

This museum dedicated to the history of the medical bone trade and human osteology.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

The overgrown remains of one of the premier auto-racing speedways in the Midwest—and also one of the most deadly.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

A group of college students hauled a desk up a mountain more than 40 years ago. The notebooks inside have become a makeshift time capsule.

The longest navigable underground river in the United States is home to countless blind and albino animals.

Mysterious meeting place for UFO hunters near Area 51.

Ute tour guides have been sharing the ancient dwellings and rock art inside this large park with visitors for more than 40 years.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

This bee-themed family business does more with honey than anyone would think was possible.

When in Idaho, sleep in a giant potato.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

Off the Florida coast, a whimsical world of marine sculptures are revitalizing coral reefs.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

One of the most acclaimed eateries in Arkansas is a two-table diner on the ground floor of a family home.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.