A miniature train-ride through Slovenia's largest cave system.

The "dragon babies" of southeastern Europe.

A whimsical bridge adorned with decorative dragons.

The celebrated eyesore created by starry-eyed sweethearts.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A museum of magic with a Sadist past.

A haunting collection of the vanished and disappearing natural world.

Notorious artist squat renovated into legal studios.

France's most famous cemetery, with some of its most curious tombs.

Amsterdam's former hotspot for public executions and dissections.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

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

A beautifully eclectic mix of architectural styles.

The attic of a four-century-old canal house hides a clandestine church.

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

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

A floating cat sanctuary on an Amsterdam canal.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

The Uros people live on floating reed islands in lake Titicaca.

Huge stone depressions which may have acted as an Incan agricultural experiment.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.