Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

The last of Amsterdam's original sea level markers remaining in place.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

A miniature city, once ruled by the Queen of the Netherlands.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

This miniature take on the Kremlin is one Dutch man's retirement project.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

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

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

A market built atop boats is one of the few floating holiday markets in Europe.

A set of seven houses, each built in a style that represents a European country.

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

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

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

Europe's official "zero-level," the equator of elevation.

A former plague hospital turned medical museum.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

Colorful and chaotic stacked hotel in North Holland.

A public urinal so pretty, it was declared a national monument.