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this ancient temple was built as a temple to all the gods of the Roman state but has served as a Christian church since the 7th century. It is the only building from the Graeco-Roman world which has remained substantially intact and in continuous use throughout to the present day, and as it is still a functioning church, silence is requested during your visit. The Pantheon is celebrated for its large dome.
The hole in the center of the ceiling, though, is an original feature designed for architectural reasons (the dome would collapse without it.) If it happens to be raining, you should definitely go to the Pantheon to see the rain pouring into the building through the hole in the ceiling. There are holes in the ground that drain the water.