Rome is Italy's capital city and, in classical antiquity, the center of the Roman Empire. Because of the city's long and storied history, it is known as the "Eternal City". Presently, Rome has become a large "open-air history museum". Inside the city, many traces of ancient Rome have been preserved. You can go to the Colosseum—one of the symbols of the powerful ancient Roman Empire. At the Roman Forum, you will be shocked and amazed by the prosperity of the ancient imperial world. The Pantheon is a place where you can see architectural miracles constructed over 1,000 years ago. Within the city of Rome, there is also a country within a country—Vatican City. This is a place where you can experience the ultimate in Christian religious art and see many masterpieces left behind by Renaissance masters.