The Musée du Fort is housed in a building from the early 1800s, built on a site which served as a refuge for the Huron indians from 1650 to the late 17th century. Property of the king at that time, it was one of the outbuildings of the Château St. Louis, residence of the governors of New France, situated at about the same location as the current Château Frontenac.
Listed as a historic house in 1964, it has long been occupied by the Grand Truck Railway, now the Canadian National Railway, before being selected by Anthony Price to install this museum. He had the idea in 1960, during a visit to the Confederama Hall of History in Chattanooga, Tennessee.
http://fr.canoe.ca/voyages/sechapper...13-122551.html
I'll try to find some details about the cathedral tomorrow.