Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Abandoned mini-mansions that were once intended for affluent Bangkok families now sit empty.

Drink and dine in a coral cave that's at least 120,000 years old.

At the center of an island in the middle of the Indian Ocean is a deep chasm ringed by tall waterfalls.

The closest thing to Mars on Earth.

A limestone wonderland of water and subterranean secrets.

This floating cinema brings new meaning to the phrase "going out" to the movies.

A forsaken beachfront condo abandoned after the Boxing Day Tsunami.

Surat Thani's official flower—and the world's largest—smells of rotting meat.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

This sprawling woodland estate was the brainchild of iconic American industrial designer Russel Wright.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.