Salzburg is the fourth-largest city in Austria and the capital of the federal state of Salzburg. Salzburg's "Old Town" is internationally renowned for its baroque architecture and is one of the best-preserved city centers north of the Alps. It was listed as a UNESCO World Heritage Site in 1997. The city has three universities and a large population of students. - Salzburg was the birthplace of 18th-century composer Wolfgang Amadeus Mozart.