Inside this curiosity shop, visitors can peruse the clown collection or purchase a molar from the mouth of Bigfoot.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

This 18th-century sundial was designed to calculate the date of Easter each year.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

France's national museum of scientific and industrial instruments.

The commemorative stone column conceals a secret laboratory.

This legendary urban waterfall creates a dazzling display of rainbows.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The yawning maw of this pagan visage is said to bite off the hands of liars.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

Former hunting lodge of a duke who was an avid collector of impressionist works.

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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