Kirkhill your rationale may be fine, but your history is a little inaccurate. Fort Henry's second construction and large fortification was completed in 1837. It was abandoned by the British in 1870 and only occupied by Canadians until 1891. It fell into disrepair until 1936 and was opened as a museum in 1938.
Fort Henry's other purpose was to guard the Royal Naval Dockyards at the current site of RMC.
The Halifax Citadel is run/owned by Parks Canada and has been a historic site since 1951. At its peak, the gunners were responsible for more than 2700 guns within the city's defence complex, a tall order, for the number of artillerymen in Halifax rarely exceeded 350. To help make up the shortage of trained gunners, Artillery NCOs spent much of their time instructing infantry and militia in the art of artillery drill.
The major role for the Citadel after 1900 was to provide barrack accommodations and act as a command centre for other harbour defences. In 1939, the Citadel was used as a temporary barracks for troops going overseas.
So perhaps La Citadelle is the best/only example that meets your criteria for longevity.
Fort Henry's other purpose was to guard the Royal Naval Dockyards at the current site of RMC.
The Halifax Citadel is run/owned by Parks Canada and has been a historic site since 1951. At its peak, the gunners were responsible for more than 2700 guns within the city's defence complex, a tall order, for the number of artillerymen in Halifax rarely exceeded 350. To help make up the shortage of trained gunners, Artillery NCOs spent much of their time instructing infantry and militia in the art of artillery drill.
The major role for the Citadel after 1900 was to provide barrack accommodations and act as a command centre for other harbour defences. In 1939, the Citadel was used as a temporary barracks for troops going overseas.
So perhaps La Citadelle is the best/only example that meets your criteria for longevity.