The subterranean sanctuary home to local shamans is a sacred site for people of all religions.

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

Nature’s skyscraper launches out of the terrain with attitude.

Burial site of the world's most widely known researcher on the endangered mountain gorilla.

This sacred, circular cave is lined with pools so clear and still that it's hard to tell where the water begins.

Founded as a refugee camp, now a popular tourist spot.

The true depths of these stunning Moroccan caves are unknown.

Mosaics, storks, and brothels—this ancient city has it all.

An eerie former warehouse turned cistern turned movie set.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

Moss and stone turn this waterfall into an otherworldly liquid veil.

Astonishing rock formations dot the Brimham Moor landscape.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

One of the last free public hot springs is decorated with hippie art.

This snug medieval lane is one of the narrowest streets in the world.

Home to a full cast of the largest woolly mammoth ever recovered in North America. 

One man's eclectic collection of treasures found at sea.

The large collection of pre-Columbian pottery might make you blush.

Home to the world’s oldest seismograph and a four-ton steel ball that makes its own earthquakes.

Stunning ruins of what was once the center of one of the greatest empires in East Africa.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

This "floating island" plateau sits 7,671 feet above the forest floor.