Touring the Eternal City is always a great pleasure, but not when fellow visitors get sloppy with drink bottles, paper cups, sandwich wraps, cigarette butts and other debris. When in Rome, do as the Roman do to keep the city clean. Otherwise, it could cost you money. 

City officials enforce a municipal ordinance outlawing all eating and drinking in areas of "particular historic, artistic, architectonic and cultural value." They include such popular landmarks as the Colosseum, Trevi Fountain, Pantheon, Spanish Steps and others. Unless you’re prepared to pay a $650 fine, obey both the law and what should be considerate behavior for other visitors and Romans.