The Albertina is home to one of the most important art collections in the world. This museum includes classical modernism works from the Batliner collection, graphic art works ranging from Albrecht Dürer to Andy Warhol, approximately 100,000 photographs, as well as 50,000 architectural drawings and models ranging from Johann Bernhard Fischer von Erlach to Clemens Holzmeister. In 2004, Vienna architect Hans Hollein created a spectacular titanium flying roof to span the entrance to this classical palace.