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

An exotic reptile facility showcasing some of the rarest, most venomous snakes in the world.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Florida castle built with aluminum printing plates.

This kitsch eatery is chock-a-block with bric-a-brac.

The largest retailer of seashells in the world.

The smallest post office in the United States is no bigger than a broom closet.

A time capsule of Floridian history fights to survive on the banks of Chokoloskee Bay.

An errant donkey ushered in a new era of mining in Nevada.

A land of debatable treasure.

This massive crater in the middle of nowhere was used to train astronauts for moon landings.

The farthest you can be in the contiguous U.S. from a McDonald's location.

In the middle of a remote desert town is a surprisingly opulent hotel.

An enormous illuminated figure dances on the Las Vegas strip.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.

There's nothing creepier than a cemetery next to a clown motel.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

Odd outsider art installations surround a Gold Rush-era ghost town.

The highway's southernmost spot is a beloved local attraction.

Don't blink or you'll miss it.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.