A massive marble foot is tucked away in a small alley near the Pantheon.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

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

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

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

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

Architectural monsters are devouring this palace's every door and window.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Among the busts of heroes of the Roman Republic of 1849, there is also a statue of a boy and his dog.

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

The final resting place of the poets Shelley and Keats.

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

This curious, round temple is the oldest still-standing marble building in Rome.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

The mystic whose incorrupt corpse still attracts the faithful.

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

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