The Pantheon is a former Roman temple, now a church, located in Rome, Italy. Built around 126 AD during the reign of Emperor Hadrian, it is renowned for its large dome and oculus, which is an opening at the top that allows natural light to enter. The structure is a remarkable example of ancient Roman architecture and engineering. The Pantheon is dedicated to all the gods of Ancient Rome and features a circular design with a portico of large granite columns. It has been in continuous use throughout its history and is one of the best-preserved monuments from the Roman Empire, attracting millions of visitors each year.