This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An emerald-green grotto just a short trip from Austin.

Most-visited and most-photographed slot canyon in the American Southwest.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Rippling sand dunes frozen in the Arizona rock.

An exquisite tunnel of cascading flowers.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Extraordinary sculpture garden created by an eccentric English poet.

A walkable map of the world, made from soil and stone by one man.