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

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

Its interior is adorned with some of the best examples of early Christian mosaics.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

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

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

A medieval weapon rumored to have been used by the brilliant poet himself.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.