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

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

Banksy gives themself artistic license with this piece of London street art.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A Jenga-style cylindrical tower of books that appears to go on forever.

Countless grotesque faces stare out from this eerie Prague art wall.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Two stunning 17th-century libraries and a cabinet of curiosities.

Macabre astrological automaton clock dating to the late 1400s.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

The medieval network of canals hidden underneath the city is opened to explorers each year.

This 19th century cyclorama acts like an analogue time machine to a different era.

The amazing wonder cabinets of a very rich Austrian archbishop.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

After hundreds of years of settlement, this once-bustling fishing village sunk into the Chesapeake Bay.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.