This church carved into the rocks is full of enchanting stone statues.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

Thousands of well-dressed mummies below a monastery.

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

A Wild West jailhouse that slid down the mountainside.

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