A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

This abandoned amusement park was built on a site with a dark history.

Two New York rooftops are home to the largest rooftop soil farms in the world.

World's largest cave was only discovered in 1991, and now offers tours to the public.

The largest radio telescope in the world searches for extraterrestrial life from the remote limestone peaks of southern China.

The largest traditional Chinese medicine market in the world sells ingredients that may make you squirm.

Stone shrouds of Prince Liu Sheng and Princess Dou Wan of the Han Dynasty, created to preserve their flesh for eternity.

The western-most fortress on the Great Wall of China has gone from a strategic stronghold to a kitschy tourist carnival.

Comprised of thousands of cave temple carvings this cornucopia of ancient Chinese stone art is unrivaled anywhere in the world.

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

This terrifying glass bridge on the side of a mountain cracks as you step on it.

The field of tiny caves that mark this Chinese cliffside are each their own historic Buddhist temple.

These layered sandstone mountains in China look like they are made of pressed crayons.

Enormous burial mounds of ancient emperors.

China's beehive-shaped pyramids house the remains of a lost kingdom.

Rock-cut caves and 7,000 Buddhist sculptures carved into the nearly sheer face of a sandstone mountain.

An underwater road considered a possible Atlantis location.

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

One of the deepest blue holes in the world.

In paradise, feral pigs have claimed an island all to themselves.

"Satisfying" is a good way to describe these beautifully aligned rows of Spanish mills.

This small chapel is built of human bones and decorated with a golden skeleton.

Dead weights honor the dead of Portugal's fishing industry.

A cluster of granite granaries perched on stilts.