Even King Tut was intrigued by the glass of the Great Sand Sea.

A tunnel dug through the side of a mountain by hand provides convenient yet death-defying access to a small village in China.

Tropical paradise strewn with hundreds of World War II wrecks.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

A living art gallery painted on a canvas of Monterey pine trees.

This cavernous swimming spot doubles as a home to the largest known colony of bats in Central Asia.

Abandoned Japanese ghost town gives a glimpse into what our own metropolises may leave behind.

A church of bones, decorated with 40,000 human skeletons.

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

Singapore's landscaping project is home to 18 incredible Supertrees.

A vast city of the dead, where the deceased outnumber the living by more than a million.

Deadliest lake in the world suffocated over 1,746 people in one night.

The remains of diamond fever taken over by the desert.

A city built from mud and known as the "Manhattan of the desert."

An abandoned saucer-shaped monument in the Bulgarian mountains.