Exploring the wilder, more passionate sibling of Erg Chebbi feels like discovering a secret sun-kissed planet from another galaxy.

This remote lake in Siberia supposedly contains a fearsome sea monster.

Siberian ghost town built by gulag prisoners.

The coldest city in the world.

The giant Siberian crater known locally as the "doorway to the underworld" is expanding every year.

The villagers of the coldest inhabited place on Earth adjust to unique challenges presented by day-to-day living.

The unique collection of gifts includes braids of human hair, a spoon, and a Virgin made of bread.

This rare volcano spews the strangest and (literally) coolest lava in the world.

The culture that built these Tanzanian ruins displayed advanced knowledge of irrigation technology before mysteriously disappearing.

Human ancestor’s 3.6 million year-old footprints.

These strange piles of magnetized volcanic ash travel across the desert about 50 feet per year.

Unexplained bald patches in the landscape grow and recede over time, as though they are somehow alive.

Bizarre living fossil only grows in a small chunk of the Namib Desert.

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

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

The remains of diamond fever taken over by the desert.

Bohol's mysterious brown hills.

A part of the world's largest marsh seems to be growing bright red Martian grass.

Hike amid the palm trees that thrive among Southern California's Indio Hills.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

100-year-old shipwreck you can walk up to at low tide.

A Roman-style column in Oregon hides a spiral staircase inside.