A Definitive Ranking of the Top 10 Sights in the World

There's nothing like a feisty Roman monument to rev up your inner historian, and the Colosseum performs brilliantly. A monument to raw, merciless power, this massive 50,000-seat amphitheater is the most thrilling of Rome's ancient sights. Gladiators met here in mortal combat, and condemned prisoners fought off wild beasts in front of baying, bloodthirsty crowds. Two millennia on, the hold it exerts over anyone who sets foot inside is as powerful as ever.