Naples, a bustling city of a million people, can be a challenge for visitors because of its hilly terrain and its twisty, often congested streets. Although spread out, Naples invites walking; the bus system, funiculars, and subways are also options for dealing with weary legs.
The city stretches along the Bay of Naples from Piazza Garibaldi in the east to Mergellina in the west, with its back to the Vomero Hill. From Stazione Centrale, on Piazza Garibaldi, Corso Umberto I (known as the Rettifilo) heads southwest to the monumental city center—commonly known as Toledo—around the piazzas Bovio, Municipio, and Trieste e Trento; here is the major urban set piece composed of the Palazzo Reale, Teatro San Carlo, and Galleria Umberto Primo.
To the north are the historic districts of old Naples, most notably the Centro Storico, I Vergini, and La Sanità; to the south, the port. Farther west along the bay are the more fashionable neighborhoods of Santa Lucia and Chiaia, and finally the waterfront district of Mergellina and the hill of Posillipo. The residential area of Vomero sits on the steep hills rising above Chiaia and downtown.
At the center of it all is picturesque Spaccanapoli—the heart of the Centro Storico. This partly pedestrianized promenade rather confusingly changes its name as it runs its way through the heart of old Naples—it's labeled as Via Benedetto Croce and Via San Biagio dei Librai, among others. Tying much of this geographic layout together is the "spine" of the city, Via Toledo—Naples's major north–south axis, which begins at Piazza Trieste e Trento and heads up all the way to Capodimonte; it's basically one straight road with four different names (five if you count the official name of Via Roma, which is how the locals refer to it).
Via Toledo links Piazza Trieste e Trento with Piazza Dante. Going farther north you get into Via Pessina for about 100 yards, which takes you up to the megajunction with the Museo Archeologico Nazionale. North of that, you head up to the peak of Capodimonte by traveling along Via Santa Teresa degli Scalzi and then Corso Amedeo di Savoia.
To make things a bit more confusing, parts of Via Toledo are pedestrianized—that means no buses or scooters, thankfully—from just south of Piazza Carità (where Via Toledo/Roma intersects with Via Diaz) all the way to Piazza Trieste e Trento.