An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

An abandoned castle owned and ignored by Masons carries a cursed history.

A wonder of natural limestone formations etched by millions of years of natural interaction between rainfall and rock and air.

Home on the Hillside, and home of the first breakfast cereal.

Origin of the blue-skinned Fugates of eastern Kentucky.

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

The world's brightest bioluminescent bay.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

A natural gas leak provides a flickering flame beneath a waterfall.

Siberian ghost town built by gulag prisoners.