This demon atop the Notre-Dame de Paris looks utterly bored.

The first memorial dedicated solely to the Black troops who fought for the Union.

On this romantic tidal island reachable only at low tide the tomb of a famous French writer overlooks the sea.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

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

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Stockholm's deepest subway station is also a stunning ecological wonder.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

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.