This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

The prototype for all Nazi concentration camps.

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

Michael Jackson got Bad and Crocodile Dundee walked on heads in this iconic Brooklyn subway station.

One of the world's largest model railroads is a mind-boggling achievement.

This giant temperature attraction created some giant electric bills.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

This hospital fell into ruins after failing to act as the advocate for the mentally ill it was designed to be.

A terrific purveyor of natural history objects and curios.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

The library of every book lover's dreams.

Pluto is still considered a planet in Ithaca, New York.

Stairs often replace streets on the steep slopes of this old mining town.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

One of England's most famous churches hides a pair of little known architectural treasures.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.