The main building of the Bavarian National Museum includes on three floors exhibition rooms with in total about 13,000 square meters. The core of the collection dates from the art collection of the Wittelsbach family. This gives the National Museum an importance far beyond the local area. Diversity and breadth of the collections, however, were particularly motivated by the new additions to the subsequent period. To date, the inventory is updated continuously not only through acquisitions, but also by significant foundations and bequests. Support experienced by the National Museum, in particular, by the 1960 launched club "Friends of the Bavarian National Museum".