Stavanger is Norway's fourth largest city, at 130,000 citizens. It is the largest city in, and the administrative centre of, Rogaland county in West Norway. Stavanger is the centre of the Norwegian oil industry and has the only petroleum museum in Norway. It also has a preserved old town on the west side of a charming waterfront. Stavanger cathedral is largely unchanged since early 12th century and the best preserved cathedral in Norway.