The Ontario Regiment, Royal Canadian Armoured Corps, was constituted in 1866 and moved its headquarters to Oshawa at the beginning of WW1. One of many standard armouries built at the time, the Officers’ Mess is still located in the Romanesque building in downtown Oshawa, and may in fact be haunted.
This location is purported to have a ghost that walks the grounds and the interior of the building. Several support staff over the years have acknowledged the existence of this ghost.