The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A spectacular cave and a beguiling lake.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

A bomb shelter and some fireplaces are all that remain of the house Fred Roberts tried so hard to keep standing.

Abandoned bridge hidden deep in the San Gabriel Mountains.

A fiery crater has been burning in the Karakum Desert since 1971.

An emerald-green grotto just a short trip from Austin.

The rocks in this arid basin leave trails of movement behind them.

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

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

The L.A. Zoo has a secret garden of rare bootleg cycads, a palm specimen dating back 280 million years.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

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

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

The site of a classic series of Laurel and Hardy pratfalls.