Naples compresses 2,800 years of Mediterranean power into seven square kilometers of the Italian peninsula's most congested historic core. Founded as Neapolis by Greek settlers in 470 BCE, the city layers Angevin fortresses atop Roman amphitheaters, Baroque basilicas beside medieval cloisters, and laundry lines strung across alleys where Caravaggio hid from papal authorities in 1606. The centro storico, a UNESCO World Heritage Site since 1995, holds more than 400 churches — a higher density than Vatican City — and the world's oldest continuously operating pizzeria, Antica Pizza Port'Alba, wood-fired since 1738. A Naples private walking tour reveals what motorized transit cannot: the hidden entrance to Napoli Sotterranea's Greek-era quarries forty meters beneath Piazza San Gaetano, the votive shrines tucked into Spanish Quarter staircases, the Caravaggio altarpiece inside Pio Monte della Misericordia visible only on foot. Private guides unlock courtyards closed to independent visitors and negotiate the centro storico's non-grid layout, where via dei Tribunali and Spaccanapoli — the decumanus maximus and decumanus inferior of Roman Neapolis — still anchor the city's social geography. Street-level Naples operates on relationships: a private guide secures tasting stops at friggitorie that serve cuoppo fritto only to regulars, and explains why the city's patron saint, San Gennaro, liquefies his preserved blood three times annually in the Duomo's silver reliquary. The value of custom itineraries becomes clear in a city where Caravaggio's Seven Acts of Mercy, the Sansevero Chapel's Veiled Christ sculpture, and the Teatro di San Carlo — Europe's oldest working opera house — lie within a fifteen-minute walk but require advance knowledge to access efficiently. Private tours adapt to foot traffic in the Quartieri Spagnoli, avoid cruise-ship crowds at Castel dell'Ovo, and time visits to the Certosa di San Martino for clear views across the Bay toward Vesuvius and Capri. Naples rewards the walking pace: frescoed pharmacy ceilings, majolica cloister tiles, and bronze Bourbon door knockers emerge only when you slow down enough to look up.