It houses the remains of a 17th-century version of the Titanic.

This 16th-century cemetery became a recreational park during the Soviet occupation—today it's a little bit of both.

A WWII museum that tries to reenact history.

A memorial to the murdered Jews of Kaunas.

A century-old prison in the heart of Vilnius is now a lively bar, dance club, and artist residency.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

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

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

An abandoned football stadium with a tragic past.

This unique medieval artwork featuring the story of the Antichrist remained lost for decades.

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

Berlin's old airport.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

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

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

Macabre astrological automaton clock dating to the late 1400s.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.