Though the name refers to a temple for all the gods, the Pantheon is actually the burial place of Rome’s kings and other prominent figures, including Raphael. The temple was built between 118 and 128 A.D. on the site of an older temple. A feat of architectural ingenuity, it was the world’s largest dome until the modern era, has been called the world’s only architecturally perfect building, and is the best-preserved monument of Imperial Rome. Walk inside and look up—the oculus in the dome is open to the sky, letting sunlight filter in.