On your final day, head outside of Rome to explore the attractions of the Appian Way, the hill town of Tivoli, the ruins of Hadrian's Villa, and the Villa d'Este gardens.
Start: Take bus no. 118 or a taxi to the Catacombe di San Callisto on the Appian Way. The entrance is 3.2km (2 miles) south of Porta San Sebastiano Gate.
Read more: http://www.frommers.com/destinations/rome/705674#sthash.KvwKsoHd.dpbs#ixzz3Iv76Y28v