At the entrance to a 17th-century Jesuit college, you can access these ancient and evocative underground galleries. Dating from 30 to 20 BC, this horseshoe of vaults and pillars buttressed the ancient forum from underneath. Yet openings let in natural daylight, and artworks of considerable merit and worth were unearthed here, including the extraordinary bust long thought to be a portrait of the young Octavius wearing the whiskers of mourning for the murdered Julius Caesar. (Current research, alas, identifies it as his grandson Caius.)
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