Mysterious 500-year-old tapestries depict a unicorn hunt.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Try not to get slimed in Tribeca.

Elevated freight railway turned wildly successful urban park.

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

The modern birthplace of Irish freedom.

A hugely vast Irish landscape of barren rock that stretches for miles.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The fairy tale castle of the "fairy-tale king."

A bit of retro transportation flair preserved in the world's largest department store.

American soldiers discovered Europe's best one-liner at the end of World War II.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This one-time health resort was used by aristocrats around the world.

A whimsical bridge adorned with decorative dragons.

An underground city of salt.

Real bones which are said to have belonged to a Polish dragon.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

A snapshot of the city's fascinating voodoo culture.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Macabre astrological automaton clock dating to the late 1400s.

What looks like a suicide in progress is actually a statue of Sigmund Freud.