Series of underground houses inhabited continuously for centuries.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

The location of the last stand of Charles Manson's doomsday cult.

A Turkish monastery tucked into a cliff wall.

This impressive tunnel was dug entirely by hand over the course of 36 years.

Abandoned hotel with adjacent lake and golf course.

The ghost town that ended up on Ebay.

Version of the French Riviera destroyed by the sea.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

Live-in sculpture begun by one family in 1979.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

A salty cave excavated by elephants and the location of a deadly disease vector.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

These Nubian pyramids are strange and unique, even by pyramid standards.

An archaeological site believed to be the burial place of the "mother of us all."

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

A huge stone pyramid built for fun.

A giant Australian fruit and tropical farm.

Started nearly 100 years ago, this science experiment just keeps on going, ever so slowly.

Mexican food and folk art.

The hidden jewel of Disneyland: a members only playground for the Disney elite.

The ghostly remains of an accidental sea.