This subterranean necropolis holds three floors of antler-dug grave caves.

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

A toxic ghost town sitting atop a massive coal fire.

Geometry and mystery come together in an epic show of octagonal masonry.

A submerged archeological park still holds the wonders of a Roman Sodom.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

A Spanish town built into the cliffs.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

Once the most densely populated place in the world, this island is now a ghost town.

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

An abandoned settlement originally established by British colonialists in the Andaman archipelago.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

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

Giant money stones of Yap.

An isolated dive site teeming with cnidarians.

Inhospitable caverns just beneath this island paradise offer insights into alien worlds.

On Japan's Tashirojima Island, cats are king.

This Canary island is a quintessential example of nature’s beauty, and its unbridled fury.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

Africa's Venice on stilts.

These strikingly barren, rolling red hills were caused by bad farming practices.

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