The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

Legends surround an ancient tree trunk riddled with nails for good luck.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

Some of the saint's blood and bones are said to reside in Dublin.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Famously misunderstood wonder of the ancient world

Medicinal spa created with the discharge from a geothermal energy plant.

In the most arid desert on the planet, the world's leading telescope allows astronomers to see more than has ever been seen before.

A fantastical group of cliffside stairways, bridges, and twisting paths carved out of stone provide a surreal coastal hike.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.