The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

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

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

One of Ireland's most infamous prisons for rebels including men, women and children.

Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

Naturally preserved bodies are eerily staged throughout the crypt in varying poses.

South of Bologna, a limestone grotto with a protruding waterfall and a floor full of cave pearls.

The prototype for all Nazi concentration camps.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

A fortified palace in the shape of a ship on the Thiou river.

To fit bodies into this Renaissance crypt, they were first left to decompose in the crypt's rotting room.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

On the shores of Lake Garda, the ruins of a Roman villa that allegedly belonged to the poet Catullus.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

The skulls and bones of thousands of soldiers line the walls of this small Italian chapel.

Austria's very first and only nuclear power station was completed but never used.

During World War II, this rice mill became a Nazi concentration camp.

A macabre anatomy museum tucked within an old Italian hospital.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

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

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.