A labyrinthine underworld of tunnels and caverns hides beneath the city.

The footprint of a frustrated devil in Munich's Cathedral.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

Fragments of human bones are embedded in the walls of this quaint alley.

An ancient fortified mound raised over the millennia from settlements built one on top of the other.

The unique circular corral belonging to the “Cattle King” of Oregon.

Ancient structures used to make and preserve ice in the deserts of Persia.

Possibly the world's oldest rug, this Egyptian relic is woven entirely from ancient cat hair and once carried a mummified human foot.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

A kaleidoscopic warehouse-maze of handmade neon signs.

Stuffed people arranged in unsettling scenes give a voyeuristic glimpse of life within a historic old hotel.

With 8,000 pipes this giant instrument is the most versatile theatre pipe organ ever built.

This quirky piece of naval artillery has been deafening Canadians for over a century.

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

This Elizabethan hedge maze is one of only six in North America.

Historic psychiatric asylum and most-filmed location in the Great White North.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

The largest stone moai on Rapa Nui.

A psychedelic labyrinth on the San Francisco bay.

An optical illusion found amid a logged redwood forest.

A crumbling wizard is one of the final reminders of a roadside Middle Earth.

Canyon walls shrouded in ferns.