This medieval castle was painted pink as part of a now-abandoned children's theme park.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

A former plague hospital turned medical museum.

Amsterdam's former hotspot for public executions and dissections.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

Colorful and chaotic stacked hotel in North Holland.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

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

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

This entire town moved to a safe location after it was devastated by an earthquake, but the remains of the original town are still around.

A luxury hotel housed in a former 15th century Gothic church.

This historical Netherlands fortress still bears the marks of its single siege.

Incredible labyrinth of man made caves.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

The struggle of a small Dutch island against the sea.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

This small electronics museum is full of whirring, humming, clicking ephemera.

While most bridges allow roads to pass over water, this one allows water to pass over a road.

The world's largest collection of ships in bottles.

The only quarter of the Old City not dedicated to a major world religion.