This tomb was fashioned with a sliding window for a grieving mother who struggled with her daughter's death.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

This mountain trail inspired Nietzsche to complete his magnum opus.

These artificial caves crafted by ancient Romans were elaborate fish farms for moray eels.

It's believed Matilda Fitzwalter's life was the basis for the famed literary figure.

An unassuming secret door once led to a legendary watering hole.

This museum located in Fondi is also said to be the most haunted building in town.

This Buddhist monastery once housed an image of Buddha containing a 19-carat diamond.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The eccentric mansion of one the most popular horror authors of modern times.

An allegedly cursed tree represents a town's reckoning with a racist past.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

Denmark’s never-ending bridge.

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

A giant Troll lurks under one of Seattle's oldest bridges.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Mysterious meeting place for UFO hunters near Area 51.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.