North of Piazza Dante Alighieri, at the far end of the port, is the Arco di Traiano (Trajan's Arch), erected in 115 BC by Apollodorus of Damascus in honour of the Roman Emperor Trajan. Luigi Vanvitelli's grand Arco Clementino (Clementine's Arch), inspired by Apollodorus' arch and dedicated to Pope Clement XII, is further on, near Molo Rizzo.
Head south along the coastal road and, after about 750m, you'll come across the enormous Mole Vanvitelliana , designed by Luigi Vanvitelli in 1732 for Pope Clementine. Just past the pentagonal building, on Via XXIX Settembre, is the baroque Porta Pia, built as a monumental entrance to the town in the late 18th century at the request of Pope Pius VI.
