Fontana di Trevi
Trevi Fountain — at eight stories high, the largest Baroque fountain in Rome — is not to be missed. It draws flocks of tourists the way food scraps draw pigeons, but don't let the masses deter you. The sculptures that line the fountain are among the most beautiful in Italy, and the photo opportunities are worth elbowing your way down to the front of the crowd.
Be sure to have a few coins with you when you get to the water's edge. Legend states that if you toss a coin into Trevi Fountain, you will return to Rome someday. A lot of people believe this to be true: About 3,000 make their way into the water every day.