This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

An abandoned railroad tunnel forgotten by time awaits inquisitive hikers.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

You would never come across this tiny green oasis if you didn't know it existed.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

An incarceration museum on the spot of possibly the oldest prison in England.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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

Locals transformed this Canadian evergreen into a secret hangout with spectacular views of Vancouver's skyline.

More than five miles of underground passageways.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Beneath the surface, something slithers. And if you find it, prepare to be slimed and glowing.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

An unfinished rail tunnel that has since been used to house cheese and bats.

Crumbling ruins mark the site of a couple's grisly murder in the woods.

The remains of one of America's first radiation testing grounds still rest ominously in a Georgia forest.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.