4 Best Sights in Piazza Navona, Campo de' Fiori, and the Jewish Ghetto, Rome

Designed by Giacomo della Porta in 1581 and sculpted by Taddeo Landini, this fountain, set in pretty Piazza Mattei, is one of Rome's most charming. Its focal point consists of four bronze boys, each grasping a dolphin spouting water into a marble shell. Bronze turtles just out of reach of the boys' hands drink from the upper basin. The turtles were added in the 17th century by Bernini.

The Pantheon area is ice-cream heaven, with some of Rome's best gelaterias within a few steps of each other. But for many Romans, a scoop at Giolitti, which opened in 1900, is tradition. The scene at the counter often looks like the storming of the Bastille; remember to pay the cashier first, and hand the stub to the counter-person when you order your cone.

A bustling marketplace in the morning (Monday through Saturday from 8 to 2) and a trendy meeting place the rest of the day and night, this piazza has plenty of down-to-earth charm. Just after lunchtime, all the fruit and vegetable vendors disappear, and this so-called piazza trasformista takes on another identity, becoming a circus of bars particularly favored by study-abroad students, tourists, and young expats. Brooding over the piazza is a hooded statue of the philosopher Giordano Bruno, who was burned at the stake here in 1600 for heresy, one of many victims of the Roman Inquisition.

One of the most important archaeological areas in Rome was only discovered in 1926 when construction around Teatro Argentina unearthed four Republican-age temples. The so-called Sacred Area was closed to the public for decades and was happily colonized by cats, who still roam the ruins. But now, a series of walkways allows up-close visits to the site, along with a small but smart collection of antiquities. The exact history of the temples is still being studied, but it is thought that the most ancient of the four (built in the 4th century BC) was dedicated to Feronia, a fertility goddess. While scholars continue to debate the origins of some of the temples here, they do agree that the large tuffa foundation behind the round temple was the Curia of Pompey, where senate sessions were once held—and the spot on which Julius Caesar was assassinated on the Ides of March (March 15) of 44 BC.