The Fortress of Louisbourg National Historic Site is a 1/4 reconstruction of the 18th century French fortress at Louisbourg. It is yet another place that you can gain admission to in Nova Scotia using your Parks Canada Discovery Pass.
http://www.pc.gc.ca/eng/lhn-nhs/ns/loui ... index.aspx
There is plenty of RV parking and you are shuttled to the fortress on a short bus ride that departs every 10 or 15 minutes from the visitor center. We enjoyed visiting it.