Some other popular sights are the Waterloo Column, the Laves House, the Wangenheim Palace, the Lower Saxony State Archives, the Hanover Playhouse, the Kröpcke Clock, the Anzeiger Tower Block, the Administration Building of the NORD/LB, the Cupola Hall of the Congress Centre, the Lower Saxony Stock, the Ministry of Finance, the Garten Church, the Luther Church, the Gehry Tower (designed by the American architect Frank O. How many parks are there approximately in Hanover