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

This strange statue features a bust of the famous composer plopped atop a woman's body.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

An Austrian house of bones filled with hundreds of intricately painted skulls.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This strange moor has a song written about it, Bronze Age carvings, and an alien sighting.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

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