Pio Clementino is one of the Vatican museums, which is located in the famous Belvedere Palace. This museum has a separate room dedicated to animals. When I entered this room, I was just stunned! The animals seem to be alive. They hunt, attack, sleep, and generally live their normal lives...But only in marble. You can stay in this room for an incredibly long time, and still not have enough time to enjoy this wonderful zoo in marble.