Ulm ( ) is a city in the federal German state of Baden-Württemberg, situated on the River Danube. The city, whose population is estimated at 120,000 (2006), forms an urban district of its own (German: Stadtkreis) and is the administrative seat of the Alb-Donau district. Ulm, founded around 850, is rich in history and traditions as a former Free Imperial City (German: freie Reichsstadt). Today, it is an economic centre due to its varied industries, and it is the seat of a university (University of Ulm, founded in 1967). Internationally, Ulm is primarily known for having the church with the tallest steeple in the world, the Gothic minster (Ulm Minster, German: Ulmer Münster) and as the birthplace of Albert Einstein.