From Japan to Italy, this California park explores the world's cultures through their gardens.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

The middle finger of modernity.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

This small chapel is built of human bones and decorated with a golden skeleton.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

The site of murders and Satanic cult gatherings.

This California tree is the single source of the state's entire orange industry.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

The most isolated mailbox in America lets desert travelers record their passing.

A working miniature city designed to teach kids about safety and presumably city planning.

A white oak with property rights.

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

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

The world's first time capsule lies behind a welded steel door in Atlanta.

The secret city built by the Manhattan Project.

The remains of one of America's first radiation testing grounds still rest ominously in a Georgia forest.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

Etched into a dry lake bed, this massive directional indicator is accurate without magnets.

Nationwide network of co-ownership underground catastrophe shelters.

Decommissioned experimental solar facilities that pioneered solar energy technology.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.