This Neapolitan exhibition hall grants weird and wonderful insight into the intricacies of human biology.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

5,000 skulls in memorial to those killed by the Khmer Rouge.

Europe's second largest ossuary wasn't discovered until 2001.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

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

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

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

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A lush indoor jungle fills this bustling Madrid transportation hub.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

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.

A quiet Sicilian village is home to a cafe that had an important role in "The Godfather."

Joe Cocker's 1988 concert at this site in East Germany marked a changing sea tide that would eventually lead to reunification.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

A seaside castle complex that stood through centuries of conquests.

The Greek island's old British cemetery feels like a forgotten garden.

Step inside an ancient beehive tomb built for a mysterious cult hero.

The walls and streets of the ancient city are peppered with penises.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.