The remains of a hospital ravaged by fire, once a progressive place of innovations for disabled children.

If a visit to this farmhouse feels as if you are stepping into an artistic masterpiece, you’d be right.

The schoolhouse where Jesse Merwin, the inspiration for the "The Legend of Sleepy Hollow" character, once taught.

The site of the first "historically true" UFO encounter in the U.S.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

This massive library holds what was once the largest book collection in the world.

The history of radiation is on safe display at the foot of a radiation science laboratory.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

Strange secondhand shop showcasing taxidermy and oddies

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

The world's largest private telescope collection hides in a secret wing of a Dutch auto museum.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

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

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

Where royalty waits in the height of luxury.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A floating cat sanctuary on an Amsterdam canal.

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

The famous winding walk at Chartres is surrounded in mystery and myth.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

A total of 22 tiny bridges cross this canal of the Yvette River, forming a unique trail.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.