Discovered after draining a local pond, these ancient man-made caves are still a complete mystery.

At nearly 1,000 feet long, this astonishing glass suspension bridge is one of the longest 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.

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

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

A natural arch offers panoramic views of Yangshuo's karst hills.

The tallest stationary dunes on Earth also happen to sing.

Snow-capped peaks, colorful waterfalls and stunning vistas on the edge of the Himalayas.

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

Though it was originally dedicated to the Hindu god Shiva, Baphuon was converted to a Buddhist temple in the 15th century, complete with a massive hidden statue.

Dedicated to improving the plight of the rare scaly anteater.

A small 12th-century temple surrounded by waters believed to have curative properties.

This Cambodian riverbed is covered in ancient Hindu carvings both above and below the waters.

A remote lodge nestled among some of the world's best-preserved rainforests.

Ferdinand Magellan dubbed the world's largest water village the "Venice of the East."

An 18th-century Nepali-style chorten built to subdue demons and evil spirits.

This 17th-century Bhutanese monastery is ensconced in Buddhist legend.

Legend has it a sacred treasure hidden by an ancient guru was revealed with a burning butter lamp from these waters.

This penis-focused monastery is dedicated to Buddhism's "Divine Madman."

This colorful overpass is one of Bhutan's longest suspension bridges.

Hidden under the thick tropical vegetation of a cemetery is the tomb of Columbo Sahib.

All that is left of an Armenian community that thrived in Dhaka 200 years ago.

The untimely death of a dignitary's daughter led to this fort being abandoned before it was ever finished.

The fight to make Bengali an official language started in this stunning university hall.