A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

The decaying ruins of Wales' first asylum for the mentally ill.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

A long abandoned hospital building on the outskirts of NYC.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

Once a place of peaceful repose, this sanitarium now faces an uncertain future.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

The abandoned hospital whose elaborate ghost stories cover up the dirty truth - an uneventful sanitation issue and other mundane reasons for its demise.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

An abandoned asylum where patients have been forgotten but their possessions remain.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

One of the world's largest collections of rare and magnificent bird specimens.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

The anatomical-pathological collection of a man who changed surgery.

Lithuania's outdoor sculpture trail of wooden folk art.

A narrow strip of land is home to the tallest migrating dunes in Europe.

Hidden in a Scotland museum is a copse of extinct tree stumps.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

An unusual manor of stunning beauty, born out of a crippling disease.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.