text: The MyZeil shopping center in this city designed Massimiliano Fuksas resembles a Klein bottle.  
full_question: The MyZeil shopping center in this city designed Massimiliano Fuksas resembles a Klein bottle.  In 1909, the world's first airline, DELAG, was founded in this city, and this city was the origin of the Hindenburg.  The headquarters for IG Farben, the Poelzig Building, was the site of the Headquarters of the Allied European Forces and is now the main lecture hall of Goethe University.  The ten tallest buildings in Germany are located in this city, including the tallest, Commerzbank Tower.  For 10 points, name this Hessian city, the commercial center of Germany on the Main River.
first_sentence: The MyZeil shopping center in this city designed Massimiliano Fuksas resembles a Klein bottle.  