The hottest place on the planet.

Supposedly this Ethiopian chapel holds the Ark of the Covenant, guarded by virgins who cannot leave the building.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

An ocean in the making, in the Ethiopian desert.

The skeletal remains of the famous hominid "Lucy" were found at this spot.

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A unique rock formation that only a few have managed to venture inside.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

A small house sits between two huge rocks, with its back to the sea.

The only residents of this abandoned housing development full of identical castles are stray cats and dogs.

Ten shipwreck-shaped chalets lie along the sand dunes on Namibia’s Skeleton Coast.

Far from the shore, this sandy victim of the Skeleton Coast looks like it was plopped in the middle of the desert.

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

At the point of oceanic inaccessibility, you can't get farther from dry land without leaving the planet.

Located more than 600 feet beneath sea level, this tunnel boasts the world's first undersea roundabout.

In the foothills of the lesser Caucasus, a centuries-old fortress still stands.

The atmospheric road was never meant to be so creepy.

This eerie abandoned building with a dark history is said to be one of the most haunted places in the Philippines.

Hundreds of wooden coffins dangle from cliffs and caves in the Philippines.

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.