A magnificent horde of futuristic skyscrapers and steel-and-glass buildings tower over the city's imposing landscape, standing guard to what is one of Europe's largest financial centers. Nicknamed 'Mainhattan' for its businesslike austerity and commercial spirit, Frankfurt Am Main appears visually incongruous with the rest of the German cities, but is also vastly representative of the culture's emphasis on meticulousness and detail. One of world's largest stock exchanges calls this city home, as do a warren of national banks and financial institutions. Behind its seemingly stuffy veneer however, exists a more down-to-earth spirit, manifested largely in traditional architectural examples that are sprinkled across the heart of the city. There is a host of 20th Century architecture that dots its bonny streets, including timeless landmarks like the Goethe Haus, the post-war Bayer Haus and the Frauenfriedenskirche. Römerberg, Frankfurt's nostalgic plaza in Old Town, houses a beautifully rustic set of half-timbered houses and 19th Century churches that divert attention from the city's lucrative pursuits. Other landmarks like the famous Alte Oper remind about the city's cultural passions which reach full realization in this 19th Century concert hall.