- The Mouth of Truth (La Bocca della Verità) is believed to be a lie detector.
- Audrey Hepburn and Gregory Peck played a scene of Roman Holiday (1953) by William Wyler, in front of the Mouth of Truth.
- The Mouth of Truth dates from the first century.
- Located in the portico of the Basilica of Saint Mary in Cosmedin, Rome, Italy.
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