Fodor's Expert Review Cryptoportiques

Entering through the elegant 17th-century City Hall, you can gain access to these ancient underground passages dating from 30–20 BC. The horseshoe of vaults and pillars buttressed the ancient forum from belowground. Used as a bomb shelter in World War II, the galleries still have a rather ominous atmosphere. Yet openings let in natural daylight and artworks of considerable merit have been unearthed here, adding to the mystery of the site's original function.