Kunstmuseum Basel. The Kunstmuseum Basel houses the largest and most significant public art collection in Switzerland, and is listed as a heritage site of national significance. Its lineage extends back to the Amerbach Cabinet, a collection of works by Hans Holbein purchased by the city of Basel in 1661, which made it the first municipally owned and therefore open to the public museum in the world. Its collection is distinguished by an impressively wide historic span, from the early 15th century up to the immediate present. Its various areas of emphasis give it international standing as one of the most significant museums of its kind. These encompass: paintings and drawings by artists active in the Upper Rhine region between 1400 and 1600, and on the art of the 19th to 21st centuries. The Kunstmuseum possesses the largest collection of works by the Holbein family. Further examples of Renaissance art include important pieces by such masters as Konrad Witz, Hans Baldung, Martin Schongauer, Lucas Cranach the Elder and Mathias Grünewald. The main features of the 17th and 18th centuries are the Flemish and Dutch schools, German and Dutch still life painting. Key works from the 19th century include the Impressionists represented by Édouard Manet, Claude Monet, Paul Gauguin, Paul Cézanne as well as the paintings by Vincent van Gogh and Switzerland's Arnold Böcklin and Ferdinand Hodler. In the 20th century, the focus is on works of Cubism with Picasso, Braque and Juan Gris. Expressionism is represented by such figures as Edvard Munch, Franz Marc, Oskar Kokoschka and Emil Nolde. The collection also includes works from Constructivism, Dadaism and Surrealism and American art since 1950. Further highlights are the unique compilations of works from Pablo Picasso, Fernand Léger, Paul Klee, Alberto Giacometti and Marc Chagall. In the realm of more recent and contemporary art, the collection maintains substantial bodies of work by Swiss, German, Italian, and American artists, including Joseph Beuys, Andy Warhol, Jasper Johns, Georg Baselitz, A.R. Penck, Brice Marden, Bruce Nauman, Jonathan Borofsky, Roni Horn, Francesco Clemente, Mimmo Paladino, Enzo Cucchi, Martin Disler, Leiko Ikemura, Markus Raetz, Rosemarie Trockel and Robert Gober. In the year of 1939 a large body of work by German-Jewish artists, whose paintings were considered to be degenerate art by the Nazi-Regime in Germany could be saved by the Kunstmuseum, were brought to Switzerland and are on display in the museum up to this day. The Kunstmuseum's main building was designed and constructed 1931-1936 by architects Paul Bonatz und Rudolf Christ. In 2008, the museum acquired land on the other side of Dufourstrasse and an architectural competition was held. With international star competitors, such as five Pritzker Prize laureates, all pitching, eventually a young local firm, Christ & Gantenbein, won the project. The final design is an angled building, faced with concrete bricks, and at the same height as the original museum. Building work for the $112 million project began in 2013 and was inaugurated in April 2016. The project was funded by the Canton of Basel-Stadt and the Laurenz Foundation, established by Maja Oeri. The extension adds 2,750 square meters of galleries, to a total of nearly 10,000 square meters. The original museum now houses art from the 15th century to 1950, with later works in the extension. The upper floor of the new building houses temporary exhibitions and the middle floor and part of the ground floor the permanent collection. In 2013, the Kunstmuseum had 238,000 visitors.