The architecture of Aarhus comprises numerous architectural styles and works from the Middle Ages to present-day. Aarhus has a well-preserved medieval city center with the oldest dwellings dating back to the mid-1500s and some ecclesiastical structures such as St. Clemen's Cathedral and numerous smaller churches that can be traced back to the 1100s. The industrialization of the 19th and 20th centuries left distinctive industrial structures, important National romantic works and some of the best examples of Functionalist architecture in the country. The history of the city as a Viking fort is evidenced in the street layout of the Latin Quarter, the wider Indre By neighborhood testifies to its later role as a Market town and center of commerce while the Frederiksbjerg, Trøjborg and Marselisb