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

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Where once there was a train station bathroom, there is now this German burger joint.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Reminders of the Battle of Berlin still scar the railway.

A 12th-century fortress containing some of Berlin's oldest buildings.

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

The majority of the highest mountain in Poland is actually located in a different country.

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

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Austria's very first and only nuclear power station was completed but never used.

A monument to the bloody fight against fascism in Slovakia during World War II.

A relic of the Cold War tucked away in the forested hills above Bratislava.

Tourists often confuse this beautifully ornate former cigarette factory for a mosque.

When the rain falls, this drain system turns into a musical instrument.

An ornate private entrance to the Vienna subway built specifically for the emperor.

This cubist Vienna church building looks like some sort of alien stonehenge.

A bronze replica of an elm tree that honors the victims that perished in Pawaik Prison.

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