This hidden gem of a park is on the Celian hill, next to the Colosseum (no, not the Palatine hill; the one across from it). With umbrella pines, fountains, 16th-century villa (during the Renaissance, the area was the property of the noble Mattei family), and ancient Egyptian obelisk, it's the perfect Roman escape from the busy nearby attractions. On the weekends, expect to see local families picnicking and relaxing.