The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an 8th-century Buddhist master.

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

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Ozymandias’ time-keeping temple.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

Centuries-old bridges grown from tangled roots.

The largest stone moai on Rapa Nui.

A mecca for India's Jains.

A fifth-century temple improbably built into the side of a cliff.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

The Icelandic Sea Monster Museum explores the area's history of aquatic cryptid sightings.

China's very own Atlantis is an ornate dynastic city resting at the bottom of a lake.