Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

Ruins of a German Castle on top of a towering stone pillar.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

Executed in 1401, Exhumed in 1878, Stolen in 2010.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

The Pope’s secret escape route.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

Bohemian paradise covered in majestic forests.

A church of bones, decorated with 40,000 human skeletons.

Two monstrous faces loom over a village in Czechia.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

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

The first museum in the world devoted to sexual gadgetry.

Macabre astrological automaton clock dating to the late 1400s.

Stay in the one time home to one of Scotland's most notorious gentleman's sex clubs.

A site of pagan worship which still attracts people looking for fairies.

Famously misunderstood wonder of the ancient world

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Human-made caves excavated to hide a secret society of wealthy pagans.