This unattributed sculpture in Amsterdam is hiding in plain sight.

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

This cheese shop also houses a museum devoted to Dutch dairy.

A beautifully eclectic mix of architectural styles.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The history and future of cannabis.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

A floating cat sanctuary on an Amsterdam canal.

The world's only museum devoted to the wonders of fluorescence.

Museum preserving torture methods from the past.

This former hydraulic laboratory is now a woodland dotted with old engineering models.

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

Repurposed space and ultra-modern construction collide to create this geometric wooden spectacle.

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

The gargoyles and grotesques of the 21st century are here—22 emoji built into a new building in the Netherlands.

At the base of this tower, a plaque marks the original center point of the Netherlands.

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

The location where the American Revolution ended.

In 1932, Americans honored their first president's 200th birthday by planting trees.

This large garden vase urn has nothing to do with the seventh U.S. President—it was designed by one landscape designer to honor another landscape designer's contributions to the National Mall.

This American Civil War-era fort still stands near the border between Washington, D.C. and Maryland.