City: Imperial Rome

— best viewed in spring when the flowers are in full bloom. It was the work of Francesco de Sanctis in the 18th century. The stairs lead to the Trinità dei Monti Church. At no. 26 on the piazza is the Keats-Shelley House where Keats died of tuberculosis at the age of 25.

It’s a rare visitor who hasn’t sat for a while on one of the landings — there’s one every 12 steps — perhaps to download an e-mail from home on a laptop or observe the other sitters, most often young. The fountain at the foot of the steps was designed by Bernini’s father at the end of the 16th century, and it’s reputed to have the sweetest water in Rome. Allow at least 30 minutes for a visit.

After perhaps a shower and rest at your hotel, take bus no. 30, 40, 62, 64, 70, 87, 116, or 492 to reach the:

Piazza Navona

The most beautiful square in all of Rome — and best seen at night — is like an ocher-colored gem, unspoiled by new buildings, or even by traffic. The shape stems from the Stadium of Domitian, whose ruins lie underneath. Great chariot races were once held here. In the center is Bernini’s Fountain of the Four Rivers, floodlit at night. During summer evenings there are outdoor art shows. Some of the oldest streets in Rome surround Piazza Navona. There is no more romantic place to dine in all the city.

For your arrivederci to Roma, take bus no. 62, 95, 175, or 492.

Fontana dei Trevi (Trevi Fountain)

This is an 18th-century extravaganza of baroque stonework ruled over by a large statue of Neptune. Visitors come here at night for 20 minutes or so to toss a coin into the fountain, which is said to ensure that you will some day return to Rome.