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

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

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

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

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

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

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

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

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

2300-year-old Roman road connecting the empire.

Gods clash with machines in a power plant regenerated as a museum.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A sculpture serving as an homage to Pope John Paul II.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

The underground sanctuary of a mysterious ancient cult.

Charles Dickens was not a fan of the ghastly wall dressings in this 6th century church.

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