Running the length of the west side of Bebelplatz, the former royal library is now part of Humboldt-Universität, whose main campus is across the street on Unter den Linden. The university building was built between 1748 and 1766 as a palace for Prince Heinrich, the brother of Frederick the Great. With its founding in 1810, the university moved in. The fairy-tale-collecting Grimm brothers taught here, and political philosophers Karl Marx and Friedrich Engels studied within its hallowed halls. Albert Einstein taught physics from 1914 to 1929, when he left Berlin for the United States.
- Address: Unter den Linden 6, Mitte: Unter den Linden, Berlin, 10117
- Location: Mitte