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

This Polish cave has housed a dragon, a brothel, and an enduring legend.

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

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

A portable, wooden replica (minus the hyphen) of Hamburg’s iconic crooked coffee shop.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

An abandoned swimming pool decays on the outskirts of Berlin.

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

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

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

An eerie, derelict amusement park in Berlin.

Museum deep in the catacombs of St. Michael the Archangel Church is explored by touch, sound, and smell.

A mysterious emblem tucked in an small alleyway is actually the coat of arms of a heroic medieval family.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.