The Cathedral of Santa Maria del Fiore is the main church of the Catholic Diocese of Florence and the third cathedral in the world. It is the symbol of Florence. Tickets: Free of charge, the tower, the dome, the baptistery, the underground palace and the affiliated museum have a joint ticket of 15 euros. The tower is a square building with the stairs spiraling around and the aisles are very narrow and many steps are polished. Looking up from the top of the tower, the layers are declining one by one. The middle is the hollow area. The area to the top of the hollow is the smallest. It is sealed with an iron frame. It can be walked on, standing, many people go to the edge and squat, or I dare not stand up. Imitation from the dome of the Pantheon in Rome is a symbol of the original spirit of the Renaissance. The genius architect Brune Necky did not draw a sketch, did not make any calculations, or even took the internal scaffolding, and started construction with mental arithmetic and precise space imagination. The city is under the sunshine, the retro and elegant dark yellow, with a strong medieval taste.