The settlement area of Edgar contains sites of historic interest including the unique "African Church". Around 1906 a tall wooden tower was constructed by the Federal Government as part of a "geodetic survey". (Other towers were located at Peterborough and Orangeville.) After W.W. II, three radar domes were constructed on the site which became part of the "Greenline" defense system in conjunction with the early radar warning system that watched for Soviet bombers and ICBMs during the "Cold War".
The story goes that the very first Girl Guide Cookies were sold in order to put a new roof on the Girl Guide Camp in Hawkestone Tunnels from the wharfs into the cellar of the main building were once used for carrying supplies. (Folklore suggested that they might have been for hiding the transport of liquor or Blacks as part of the underground railway. The latter story is highly unlikely.)
The TransCanada Pipeline went across Oro in 1958. In the early days there were a number of "ruptures" of the pipeline that could be heard many miles away--they sounded like a jet plane.