Real bones which are said to have belonged to a Polish dragon.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.

A heavily politicized roundabout discussing the state of a heavily politicized country.

Catch a scenic view of Warsaw's Old Town from the top of a centuries-old dumping ground.

A garden in Lisbon filled with giant porcelain creatures.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A fascinating insight into daily life in the Eastern Bloc.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

A subterranean display of public art and architecture.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

One of the most easily accessible examples of the rare 1960s UFO houses.

An abandoned Byzantine fortress and notorious prison.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.