This building is ancient Rome's best preserved monument. The emperor Hadrian reconstructed it around 120 AD when an older temple sitting on the same spot was destroyed by fire. The interior is really striking, with its dome a perfect hemisphere and an oculus which is believed to symbolize the all-seeing eye of heaven. I really liked this building, it has a certain geometrical harmony which reminded me that in architecture sometimes the simplest things achieve the biggest effect. Inside is Raphael's tomb and the tomb of Vittorio Emanuele II, Italy's first king. Address: Piazza della Rotonda. (from: http://andreea.francu.com/travel/rome.vr/places.vr/).