Heidelberg is (along with Ludwigshafen and Mannheim) one of the centers in the Rhine-Neckar region. In 1196 Heidelberg (at that time still titled "Heidelberch") was mentioned in documents for the first time. With nearly 150,000 inhabitants - including 30,000 students from four universities and universities of applied sciences - Heidelberg has one of the highest student densities in all of Germany. The city on the Neckar is visited by millions of tourists every year and is one of the most popular university cities in Germany. Heidelberg is a university town and therefore offers students and night owls all kinds of nightlife options with numerous bars, clubs, discos and pubs. The center of Heidelberg's nightlife is in the old town.