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.

Thousands of well-dressed mummies below a monastery.

A 16th-century horror show built in a lovely Italian garden.

The hidden lair of an alchemist rediscovered in a 2002 flood.