The site of Austria's biggest concentration camp now honors its victims.

Eastern Bloc nostalgia, anybody?

This historic black and white monastery is one of Bulgaria's architectural jewels.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

An abandoned resort in North Macedonia is a relic from the Communist Party of Yugoslavia.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

This conical hill was built as a testing ground for an engineer known as the Glider King.

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.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

This classic restaurant features a gorgeous mirror-clad room.

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

One of downtown Berlin's last reminders of its Communist past.

A brush maker used his factory to protect blind Jews from the Gestapo.

Architectural monsters are devouring this palace's every door and window.

A monument to the man who almost killed Hitler.

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

A national collection of Communist-era musical posters.

A hidden art gallery in an abandoned Warsaw fort.

The site of the first battle of World War II.

Warsaw's fantastically preserved gasworks...almost.

A 20th-century picture show in 3-D.

A statue honors the children who fought Nazis in Poland.

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