rome, italy - june 2014: tourists visit saint angel castle. the city attracts 15 million people annually

coliseum architecture famous place amphitheater history stadium old ancient italy rome europe built structure monument sky cultures roman travel destinations outdoors tower building exterior tourism fort the past stone material city ruin castle empire international landmark arch medieval palace tourist and buildings urban scene brick italian culture blue national locations day ruined unesco world heritage site no people facade wall feature gladiator journey