Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

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

Berlin's old airport.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

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

An old department store turned Nazi prison turned artist commune.

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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

The most visited, and possibly most controversial, museum in Germany.

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

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

A fake medieval village in the middle of Turin.

The world's longest and deepest train tunnel.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

A darkly erotic open-air statuary in Catalonia.

The Guardian of Tallinn.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.