Architectural diversity is the main feature of Germany's historic cities. At its best modern German architecture is spectacular, and enthralling. No architectural movement has had greater influence on modern design than Bauhaus - modern architecture, art and design. The use of steel to create a greater span and large glass surface was subsequently adopted by the early 20th-century art-nouveau movement. The Felix Nussbaum Museum in Osnabrück is one of the most striking examples of contemporary architecture in Germany.