This concrete residential area doubles as an open-air gallery.

The final resting place of many of Germany's most famous communists.

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

Super-heavy Nazi architectural experiment.

An abandoned cable car station located on the Danube stands like a haunted house above the river.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

A once-fairy tale mansion now stands in a state of disrepair.

The memorial stands at the intersection of the rivers Morava and Danube.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

A unique hotel for the artistic soul.

The remains of a 13th-century Romanesque church lie abandoned on a hillside.

Budapest's Communist-era statues, banished to the suburbs.

Hungarian mummies in beautiful painted coffins.

Everything from miniature biblical scenes to life-sized statues are almond-based at this sweet and nutty gallery.

Hungarian self-built castle.

One of the biggest Buddhist stupas in Europe, hidden from most locals.

"Medieval" castle built in the mid-20th century by one family.

This museum promotes informed contraception by documenting its often secret past.

Op-art architecture designed for happiness.

These crumbling monastery ruins inspired a master of German Romanticism.

This 42-foot tribute to the workforce still reminds us to pause and recharge.

According to the local First Nations folklore, this rock was once a man.