The Cathedral was built of brick, with facades of white limestone that are dressed and decorated. There are entrances to the cathedral on the eastern and the southern side of the building, with fretwork influenced by Italian Renaissance architecture. The bronze doors are decorated with gold foil. Tourists enter the cathedral via the eastern staircase, while the southern staircase is the one added in 1570 by Ivan the Terrible. The relatively high entrance is due to the fact that the building was built on the raised base of its predecessor.