A magnificent collection of imperial armor and weaponry.

Baroque celebration of the end of the Great Plague of Vienna.

Op-art architecture designed for happiness.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Europe's second largest ossuary wasn't discovered until 2001.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

A concrete plant shaped like four giant soldiers commemorates one of the most decisive battles of the Napoleonic Wars.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Dedicated to the man who saved hundreds of children from Nazi-occupied Czechoslovakia.

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 turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

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

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

This monumental work of art symbolizes the coming together of a previously divided city.

Tiny memorials honor individual victims of the Holocaust.

Cold war icon and onetime "hole" in the iron curtain.

An old department store turned Nazi prison turned artist commune.

Metro station with a claim to rock n' roll fame.

The "Prussian Versailles" that is as glorious today as when it was built.

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

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