The Ordnance Boundary Stones (OBS) were erected around the perimeter of these four properties in Niagara-on-the-Lake almost 200 years ago. Some of these stones can still be seen today. Stone #33 is located at the corner of Queen and Dorchester Streets and marks the military property at lots 79,80, 89 and 90. These lots are bound by Queen, Johnson, Nassau and Dorchester Streets.