An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Artfully arranged bones of 5,800 Austrians.

The personal charnel house of Anton Bruckner.

Mysterious painted skulls in Moravia.

Thousands of well-dressed mummies below a monastery.

Europe's second largest ossuary wasn't discovered until 2001.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

A decommissioned submarine base makes a great space for graffiti art.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Open-air museum with a large collection of Soviet-era statues.

340-foot statue built to honour the Heroes of the Soviet Union.

Last remaining nuclear missile base in Ukraine.

Launch site for nuclear war against Western Europe.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

A subterranean Holocaust refuge within one of the world's longest cave systems.

Abandoned Soviet base once stocked with short and medium range missiles pointed at western Europe.

Ghosts of France's colonial past.

Yugoslavia's biggest underground airport lies in ruins.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

Abandoned 18th century weapons factory in the Aezkoa Valley.

The deserted remains of a luxury hotel turned hospital ward.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."