Piazza della Bocca della Verita
The Mouth of Truth - or Bocca della Verita in Italian - is located in one wall of the church of Santa Maria in Cosmedin at the base of the Aventine Hill. The circular face with an open mouth resembles many of the Roman fountains around the city, but this one doesn’t spout water. For centuries, the legend has been that if you insert your hand in the mouth and tell a lie, your hand will be chopped off.
Other attractions around the Piazza della Bocca della Verita are two small Ancient Roman temples. The piazza is almost directly across from the Ponte Palatino bridge over the Tiber River, which leads to the Trastevere neighborhood.