Naples has the most underrated museum scene in Italy. The MANN (Museo Archeologico Nazionale) contains more Roman art than Rome — because everything excavated from Pompeii and Herculaneum ends up here. Capodimonte has a Caravaggio collection that rivals the Roman churches. The Cristo Velato (Veiled Christ) at Cappella Sansevero is the single most astonishing marble sculpture in Italy — and most tourists walk past the building because it's in a back alley with no sign.
1. MANN — Museo Archeologico Nazionale (Piazza Museo 19, €18). The most important archaeological museum in the world. The Farnese Hercules and Farnese Bull (colossal Roman marbles). The Alexander Mosaic from Pompeii (the most famous mosaic in existence — Alexander vs Darius at Issus). The Secret Cabinet (Gabinetto Segreto): Roman erotic art from Pompeii — phallic wind chimes, explicit frescoes, Pan copulating with a goat. Censored for 200 years, now openly displayed. The Romans had zero shame. 3h minimum.
2. Cappella Sansevero — Cristo Velato (Via Francesco de Sanctis 19/21, €10). THE most technically astonishing sculpture in Italy. Giuseppe Sanmartino (1753) carved Christ lying under a veil — but the veil is MARBLE. You can see veins, ribs, and the wound in his side THROUGH the stone veil. Your brain cannot accept that it's stone. The chapel also contains the Anatomical Machines (two skeletons with preserved circulatory systems — creepy, fascinating, 18th-century mad science). Small space, 30-minute visit, book online to skip the queue.
3. Museo e Real Bosco di Capodimonte (Via Miano 2, €14). The Bourbon royal palace on the hill — Caravaggio's Flagellation (the most violent Caravaggio), Titian's Danaë, Masaccio's Crucifixion, Raphael's drawings. PLUS: the Bosco (royal forest/park — free, enormous, picnic-worthy). The museum nobody visits because it's uphill + out of the centro. Take bus C63 from Piazza Museo. Worth every minute of travel.
4. Certosa e Museo di San Martino (Largo San Martino 5, €6). A Carthusian monastery on Vomero hill — the cloister is the most beautiful enclosed space in Naples (marble columns, skulls, citrus trees, the bay visible through arches). The presepe (nativity) collection: 18th-century Neapolitan miniature scenes with 300+ figurines. The panoramic terrace: the best view of Naples, Vesuvius, and the bay from a single point.
5. Napoli Sotterranea (Piazza San Gaetano 68, €12, guided tours only). 40 meters below street level — Greek-Roman aqueducts, WWII bomb shelters, a Roman theatre under someone's living room (you enter through their bedroom). The most atmospheric underground tour in Italy. Underground guide →