The Congress Hall was never finished. Hardly anything in Nuremberg’s “Reichsparteitagsgelände” was.
The City of Nuremberg has tried a few things to come to grips with this unwelcome legacy. First they tried to tear everything down, but after the war and in a time when people so much more needed to rebuild their heavily bombed city, demolition was not practical.
Today the Congress Hall houses a museum, the rest of the buildings is left to slow decay. The vast areas in between are intermittently used as fairgrounds or just as parks.