Castles in Iowa

Is Iowa the home of Castles in America?  With a town like Ida Grove (aka Castletown, USATM), it's hard to deny that it has impressive credentials.  Whilst Ida Grove is undoubtedly worth a visit for any castle fans (it has numerous castle-like buildings including a Skate Palace, a castellated bridge on the golf course, the HQ of the local newspaper and even an aircraft hangar), Iowa also has other castles worth visiting too.  See below for more information.