The Noon Gun has been a historic time signal in Cape Town, South Africa, since 1806. It consists of a pair of black powder Dutch naval guns, fired alternatingly with one serving as a backup. The guns are situated on Signal Hill, close to the centre of the city. The sight seeing point is officially permanently closed, and public entrance is unattainable.
A similar tradition exists in different other locations around the world, including in Nice, Hong Kong and at both Québec citadel and Halifax citadel.
Wikipedia https://en.wikipedia.org/wiki/Noon_Gun
Address Military Road, 8001, South Africa
Coordinates -33°54'54.409" N 18°24'41.596" E