Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

The most powerful laboratory radiation source in the world pulses with 1,000 times the electricity of a lightning bolt.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

More gold than anywhere else, ever.

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

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Try not to get slimed in Tribeca.

The subtle science of a master molecular gastronomist.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

A speakeasy takes on Chicago's drinking culture.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

Countless grotesque faces stare out from this eerie Prague art wall.

The only museum with its curator—and her pets—buried inside.

Venice's "Island of the Mad."

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

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

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

Looming communist pillar with a Czech twist.