The largest and best-preserved rotunda in Prague.

Some believe that the artist behind this whimsical statue inserted his own likeness as a way to discreetly flip the bird.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This small chapel built into rock is the oldest place of worship in Luxembourg.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

When you're a great Russian Tsar, even your vomit gets a statue.

Take a leisurely walk through the park to find the seven giant troll sculptures hidden throughout the park.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

An enormous and lavish Gothic church in Czechia.

A church of bones, decorated with 40,000 human skeletons.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

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

The curious underground history of keeping Paris clean.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Indents in the pavement are all that remain from a grisly death machine in Paris.

France's national museum of scientific and industrial instruments.

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

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The Cape of Good Hope is not quite as low as you can go on the African continent, but it's still geographically significant.

The first successful human heart transplant is depicted through wax figures at the hospital where it the surgery took place.