Today's Cathedral still contains a Roman central section with the original walls rising up to a height of 26 m (86 ft). The huge fragment of a granite column next to the entrance to the Cathedral is another indication of the Roman origin of the building. After destructions in the 5th and 9th centuries, the remaining nucleus was enlarged by Romanesque additions - today, the Cathedral, with its three crypts, its cloister, Cathedral Treasury, and Holy Robe Chapel, displays architecture and artwork from more than 1650 years.