The forgotten mummies of Dakhla oasis.

Egyptian treasure trove of fossils documenting the whale's transition from land mammal to sea creature.

Reputedly haunted sandstone necropolis with exquisite stone carvings.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

The world's largest natural arch was forgotten for over 50 years after its discovery.

These Nubian pyramids are strange and unique, even by pyramid standards.

The hottest place on the planet.

The world's second-largest sundial, made entirely out of stone.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

An abused and forgotten metropolis, abandoned for centuries.

A battle between nature and architecture in the Cambodian jungle.

Mount Nyiragongo has erupted at least 34 times since 1882 and is home to the world's largest lava lake.

This "floating island" plateau sits 7,671 feet above the forest floor.

A swing to dangle you off the very edge.

This massive subterranean fissure is known as the "underground Grand Canyon."

A 1,500-year-old ghost settlement is slowly fading away.

Forgotten German bunkers in China create a sharp cultural contrast.

The most famous location in China was home to whole dynasties worth of imperial rulers.

Beijing's expansive subterranean hiding spot now crumbles away as a tourist destination.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

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

Most-visited and most-photographed slot canyon in the American Southwest.

The longest living non-clonal organisms on Earth.

An ancient capital city that dates back 3,000 years old and harbors many surprises.