Festhalle is an arena in Frankfurt, Germany. It is used for indoor sports and music concerts. Festhalle has a capacity of 15,179 people. An arena is a circular or oval shaped (or sometimes rectangular) public space (akin to a classical amphitheatre), designed to showcase theater, musical performances, or sporting events. ... Skyline of Frankfurt at night is the largest city in the German state of Hesse and the fifth-largest city in Germany. ...