Canada-Places.com has listed approx 36 Historical landmarks in ON. Some of the Top rated Historical landmarks in ON are- Rideau Canal National Historic Site, Trent-Severn Waterway Lock 21 - Peterborough Lift Lock, Crawford Lake Iroquoian Village, Trent-Severn Waterway Lock 22 - Nassau Mills, Lock 5, Old mill ruins, Ingersoll Memorial Park (Yvonne “Bonnie” Holmes Mott Memorial Park), Golden Hawk Sabre Jet, Richmond Landing & Hudson's Bay Staff House.