Santa Maria della Rotonda (The Pantheon)
Year Completed: 125 A.D.
Orignially built as a Roman temple to all gods, the Pantheon was re-dedicated during the seventh century by the Catholic Church to the Virgin Mary and all Martyrs. A feat of Roman engineering, the dome can fit a sphere perfectly beneath it, representing the world being watched over by the gods. The dome of the Pantheon contains an opening which allows the interior to be illuminated with natural light. Unfortunately, the opening also lets in water when it rains, but the Romans had figured out. They constructed the floor of the temple to slant ever so slightly towards a drain in the center, taking care of the unwanted water.