A harrowing trail up a mile-high mountain.

270 million year-old forest of stone.

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

Massive series of 45 caves and over 51,000 sculptures carved from cliffsides in China.

This Tang Dynasty behemoth is the biggest Buddha in the world.

The ancient settlement attracts tourists from all over looking to learn about the Chinese vision of the afterlife.

A sacred mountaintop temple offers a fine cup of tea to visitors who can survive the journey.

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

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

This psychedelic tourist trap is a leisurely descent into madness.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

A marvel of Byzantine engineering under the streets of Istanbul.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A Turkish monastery tucked into a cliff wall.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

Small church on top of a huge rock column.

A huge monument to a bizarre book written by Turkmenistan’s longstanding dictator.

Sumptous memorial to a controversial independence.

If you want to get married in the White Marble City of Ashgabat, you should do it in this surreal disco ball building.

A dictator's gold statue once rotated to face the sun on a 75-meter high marble tower.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

A house of bones — but nobody is quite sure to whom they belong.