Over the years, Hobart had a series of coastal batteries (small forts) built to provide protection from warships coming up the river. The first of these were built one Battery Point (now an inner-city suburb full of quaint cottages and old sandstone houses).
While most of the batteries have since been dismantled, one of the last built on Kangaroo Bluff on the eastern shore, is preserved as an historic site. There are stone passages, guns and information panels, although the underground parts are closed. It's sister battery on the opposite is all open but lacks any information about what is where (at least when I was there).
Back to Battery Point, the Prince of Wales battery was constructed in the 1840s. The second or third in the area. It was later demolished but the underground magazine remains. It was apparently a location for dubious activities, so a lacked gate was put on it.
However, at times the gate is unlocked. In 2014, it was used for a night time exhibition during Dark Mofo (mid-winter, city-wide, rather odd at times art festival). The art installation wasn't particularly exciting but it did provide an opportunity to wander around old tunnels at night.
This is the entrance. (Inside on next post.)
