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The Pantheon is a monument of ancient Rome built in honor of all the Roman gods. It was built in 27 a.c. , by Augustus’ son-in-law, the consul Agrippa. After several fires, the temple was rebuilt, as we see it today, by Hadrian in 126.
Rome - PantheonThe architecture
The building has a circular structure with a rectangular porch with Corinthian columns. The large circular cell is topped by a dome with a circular aperture with a diameter of 9 meters, called Oculus. The legend sais that despite this openness, the rain never pours inside the Pantheon.
Rome - Pantheon"Chimney effect"
The truth is that the opening creates a "chimney effect" that is, an updraft that causes the crushing of the water drops and for this reason there is a feeling that the rain doesn’t drop in the inside. Moreover, on the floor there are several holes that allow the flowing of the water.