Rione II is a lively neighborhood where camera-wielding crowds descend day and night to toss coins in the iconic, baroque-era Trevi Fountain. Piazza Barberini is the site of Bernini’s 17th-century Triton Fountain. Narrow streets are lined with vendors selling everything from chestnuts to Pope-themed calendars, and trinket shops mingle with touristy restaurants and gelato parlors, including the famous San Crispino.