Spaccanapoli ("splits Naples") is a 2.5km straight street running east-west through the centro storico — following the EXACT line of the ancient Greek decumanus inferior laid out when Neapolis was founded in the 5th century BC. Look at Naples from above (the Certosa di San Martino, the Castel Sant'Elmo) and the line is VISIBLE — a straight cut through the medieval maze. Walk it and you pass through 2,500 years without stopping: Greek foundations, Roman inscriptions, medieval churches (40+ along the route), Baroque altars, 18th-century palazzi, contemporary street art, laundry overhead, scooters underneath, and the NOISE — a continuous wall of human sound that is the auditory signature of Naples.
West to east (the logical direction, downhill): Start at Piazza del Gesù Nuovo — the Guglia dell'Immacolata (Baroque spire, 1750). Gesù Nuovo church: The facade is covered in DIAMOND-POINT RUSTICATION (pyramidal stone blocks) — mysterious, possibly encoded with a musical score (a musicologist claimed to have decoded it in 2010 — debated). Inside: Baroque explosion. Santa Chiara (1310-1340): Gothic interior (rebuilt after 1943 bombing). The MAJOLICA CLOISTER — columns covered in hand-painted tiles showing rural scenes, vine-covered walkways, the most photographed cloister in Naples. €6.
Continue east: Via Benedetto Croce → Via San Biagio dei Librai (the HEART of Spaccanapoli — the street narrows, the buildings close in, the sky becomes a strip above). San Gregorio Armeno: The NATIVITY SCENE street — artisan workshops making presepi (nativity figures) year-round, including caricatures of politicians, footballers, celebrities as shepherds. The tradition: Neapolitan presepi are not just religious — they include CONTEMPORARY LIFE alongside the Holy Family. Maradona kneels beside the Madonna. A pizza maker works next to the manger. End at Via Duomo: The Duomo (Cathedral of San Gennaro — the blood miracle chapel, where three times a year the blood liquefies and Naples either celebrates or panics).
Metro L1: Dante (west end) or L2: Cavour (east end). Walk west→east or east→west — the distance is 2.5km, but stopping at churches, shops, and street food stalls turns it into 3-4 hours. SAFETY: Spaccanapoli is safe during the day (crowded = safe). Watch pockets — the density of people makes pickpocketing easy. Scooters share the street with pedestrians — they WILL pass close. Don't jump. Naples → · Street food →