The Catacombs of Saint Callixtus are some of the many smaller catacombs scattered around the Eternal City. Located on the Appian Way, the catacombs are famous for containing the Crypt of the Popes, which, as the name suggests, once contained the tombs of several popes from the 2nd to 4th centuries.
The magnificent Palazzo Colonna has been home to over 20 generations of the Colonna family and contains one of the largest private collections of Baroque art in the world.