First posted 2/10/12
Among Rome’s many churches is Santa Maria in Cosmedin, where Saint Valentine’s bones are said to be kept. However, the most famous attraction in this church is not the saint; it is the legendary Boca della Veritas—The Mouth of Truth.
We aren’t exactly sure what the Boca della Veritas is, maybe part of a fountain or a massive manhole cover from Ancient Rome. We do know that since the Middle Ages this object has served a curious purpose—as a lie detector. Read how it works (here.)