Explore the Colosseum
Built way back in 70 AD, the Flavian Amphitheatre could accommodate 80,000 spectators and was used to hold gruesome gladiator and animal fights.
Visit the Sistine Chapel
Housed in the Vatican museum complex, the 15th century Sistine Chapel is most famous for Michelangelo's the Last Judgement painted on its ceiling.
See the Piazza Navona
Built on the site of Domitian's stadium, the 15th century Piazza Navona is full of artists and street vendors. A great spot for people watching.