The old town of Naples was inhabited with Greeks settlers as a great part of south italian coast.
Foundations of the greek walls can be seen on several places as Piazza Bellini square.
There are several old churches and palates in this part of the city, around the "Spaccanapoli" until to the Porta Capuana gate and the spanish walls.
Church Gesù Nuovo
Cathedral
Spaccanapoli
Piazza Dante
Piazza Bellini
Piazza San Domenico Maggiore
Santa Chiara
San Lorenzo
Porta e piazza capuana