Yes, they are back. Visited annually by some 23 million visitors, Piazza Navona is perhaps Rome’s most beloved square after St. Peter’s. At 8:30 Saturday morning, while its cafes were serving cappuccini and corneti, a man of perhaps 45 years of age jumped into the Baroque-era Fountain of the Moor, one of the two side fountains in Piazza Navona. Cameras show that he first tried to strike at the central figure, but slipped and instead smashed at one of the marble masks that decorate the fountain border.