A library where thousands of books explain how to avoid another Great Recession.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

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

Bomb tests and sheep ranchers share the world's largest military land base.

The longest fence in the world stretches over 3,000 miles to keep the dingoes out.

This eccentric cave dwelling is bizarre even by the standards of a subterranean town.

A tiny town's spinning, whirling propeller collection holds Australia's largest windmill.

Some of the world's largest letters are carved into the limestone bedrock of the Nullarbor Plain.

An Australian lake whose pink hue defies scientific explanation.

A tiny museum in Esperance, Australia, displays a bunch of space debris from NASA’s Skylab.

No one seems to know who suffered the disappointment at this particular place.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Architectural monsters are devouring this palace's every door and window.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.