This massive subterranean fissure is known as the "underground Grand Canyon."

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

This grubby wall is said to be one of the Earth's esoteric energy centers.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Real bones which are said to have belonged to a Polish dragon.

An underground city of salt.

Haven for Cape Fur Seals, until the Ring of Death of jumping Great White Sharks arrives.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

This vestige of Seychelles’s colonial past now resides in a busy intersection and didn’t chime for its first 96 years.

A British general, a suggestive tree, a map of paradise.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

The tiny statues form China's only known terracotta army from the Han dynasty.

An ancient fortification lives on in this Chinese city.

The once highest point in China blends symbolic design with a kick of adrenaline.

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

Hidden behind musical flora and forgotten for over a thousand years, this cave is now a neon dream.

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

This psychedelic tourist trap is a leisurely descent into madness.

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

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.