Mysterious face-like images that appeared within an Andalusian house are surrounded by legends of the paranormal.

The ruins of an abbey believed to have been founded by Charlemagne in the 9th century.

A floating cat sanctuary on an Amsterdam canal.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

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

An alchemist's "magic door" stands in the middle of a Roman park.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

The first Russian Orthodox church in the Catholic city of Rome in almost a thousand years.

A museum befitting the city responsible for supplying the majority of the world's LSD.