The science departments and the main science library are located in Poppelsdorf and Endenich, west of the city center, and housed in a mix of historical and modern buildings. Notable is the Poppelsdorf Palace (German: "Poppelsdorfer Schloss"), which was built from 1715 to 1753 by Robert de Cotte for Joseph Clemens of Bavaria and his successor Clemens August of Bavaria. Today the Poppelsdorf Palace houses the university's mineral collection and several science departments; its grounds are the university's botanical garden (the Botanische Gärten der Friedrich-Wilhelms-Universität Bonn).