Trevi fountain, Rome: Legend has it that a coin thrown over the shoulder into Trevi fountain will ensure the visitor's return to Rome. Around 3,000 euros a day are tossed into the Baroque baths, retrieved nightly for charity. The travertine fountain, finished in 1762, stands at the end of the ancient Aqua Virgo aqueduct at the junction of three streets ("tre vie"), hence the name.