This monumental temple is located in the center of Rome between Piazza Navona and Trevi Fountain. This ancient circular temple was originally dedicated to all the gods, hence its Greek name Pantheon (pan-all, theon-gods). The temple was built on the initiative of Marco Agrippa between 29 and 19 BC. Its present appearance dates back to 123 AD when it was rebuilt by the Roman Emperor Hadrian after a devastating fire. Roman Pantheon is one of the best preserved ancient Roman buildings due to its continuous use throughout history. Since 609 the temple has been dedicated to St. Mary and the Martyrs. The coffered dome (which was originally covered by bronze plates) has a nine-meters wide hole (the so-called oculus), which serves as the main source of natural light. As you might wonder the Oculus is not covered by glass. So in case of rain, the water falls directly into the center of the church and it drains into the sewage system through the holes on the pavement. Inside the Pantheon, you can find tombs of famous Italians. Among others the artist Raphael, the first king of Italy Vittorio Emmanuele II and the queen Margherita di Savoia.