 The main entrance is through a portico with three semicircular doors.Behind this and between the main towers is an ample semicircular vestibule with a similarly-shaped stained-glass window, while the outside is decorated with round mosaics showing Jesus and the Four Evangelists.The cathedral is 53.10m long and 25.40m wide in the centre, the dome 24.70m high (34.70m on the exterior) and 15m in diameter, while the spires are 43m high (45m including the crosses).