The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

A mysterious castle built as a monument to lost love.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

This weeping, 10-foot-tall sculpture was a maquette for a 9/11 memorial.

What began as an art installation is now the private drinkhaüs for a brewery's employees.

Neal Cassady may still have an open tab at one of Denver's oldest watering holes.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

The highest bridge in America was built for an almost unnervingly small amount of money.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

This nonsensical smiling boat shuttles passengers between two places they could've easily walked between.

A master of deception, Harry Houdini's greatest trick may have been living in two places at once.

Experience Larry Spring's self-taught "common sense" laws of physics.

The beloved dining spot stands at the cross-section of Hollywood and the Old West.

If you dial the number in this abandoned office window "Sam Spade’s" secretary will ask you to leave a message.

The only parking meter in the entire town, it is surrounded by 100 free spaces.

Raised illegally, Reggie now lives at the Los Angeles Zoo after authorities spent years tracking him down.

This giant temperature attraction created some giant electric bills.

This California estate was either haunted by ghosts or the Marx brothers.