This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Make your reservation to have coffee with some kitties.

Natural time capsule containing an alien ecosystem.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

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

A floating cat sanctuary on an Amsterdam canal.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

Peek through a transparent pyramid and drink in the mountain made of books.

An isolated dive site teeming with cnidarians.

Ride the subways of yesteryear.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Australian Lake set aglow by Noctiluca Scintillans.

In this century-old literary safehouse, print is alive and well.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

A castle built by an eccentric medieval enthusiast in rural Ohio.

The largest drain hole in the world.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.