This gigantic monument hidden in the woods was built to thank the Dutch for sheltering Belgian refugees during World War I.

One of the Leiden's oldest pubs is also the birthplace of the Heineken star.

The largest 19th century panorama in the world still in-situ.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

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

Live out your childhood construction fantasies in this one-of-a-kind gyrating hotel.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

The largest flower auction house in the world.

Pull up and have a drink at a museum filled with hundreds of years worth of shipwreck artifacts.

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

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

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

Amsterdam's former hotspot for public executions and dissections.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

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

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

A beautiful maze marks where three countries meet.

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

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.