NATIONAL HISTORIC SITE AND PROVINCIAL HERITAGE PLACE. The Historic Garrison District is Fredericton's historic and cultural heart. Located in the city's beautiful downtown, next to the Saint John River, the Garrison is a centre for heritage, culture, craft and entertainment. This National Historic Site is where you'll find an enticing blend of musicians, artists, historic re-enactments and attractions. The Garrison District plays host to several festivals including the Harvest Jazz & Blues Festival.