As the most brilliant Gothic building in Siena, it was once the office of the Republican government.
The City Hall was built in 1297, and the Mangia Tower was once the tallest building in Italy. The city hall has an entrance and an exit; I entered through the exit by mistake, and the doorkeeper did not notice me. After a tour, I came out from the exit again and escaped her sight again.
The facade of the city hall is not in a straight line, but twists and turns along the terrain of the field square. I suspect that the right half was built later. In front of the city hall is a drainage hole about 2 meters wide. Because the square is in the shape of a funnel, rainwater will collect here when it rains.