Oldest Museum of the Netherlands is a true cabinet of curiosities.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Cat art as far as the eye can see.

The history and future of cannabis.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

This historic stone gate tower is now just a lonely relic in the middle of a swamp.

Amsterdam's former hotspot for public executions and dissections.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

An overlooked memorial honoring the local Washington residents who died in World War I.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

The span is crooked and made from two older recycled bridges.

Perhaps the most scandalous statue of America's first president.

The oldest continuously operating fish market in the United States.

It was once the base for a series of domestic terror attacks.

The most accurate timepiece in the world.

A historic ruin just 20 feet away from a busy highway onramp.

A super-sized promotional trick that is now a D.C. landmark.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.