A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

This historic recreationist school churns out warriors that may very well have had a fighting chance in Rome's pits of the day.

A modern sliver of architecture in Roma.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

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.

The largest and most famous wax anatomical collection anywhere in the world.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

A hospital where antique dolls are given new life.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Jesus' footprints and the first catacombs in the world.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

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

The final resting place of the poets Shelley and Keats.

2300-year-old Roman road connecting the empire.

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

Architectureal fantasy quarter of Rome.

This 16th-century monastery has been turned into a surrealist architecture compound.

The plague quarantine island home to the alleged "Vampire of Venice."