P1040080 Georges Head gun emplacements from 19th century. See plaque..shot See also some nice shots here. www.flickr.com/photos/leorex/7466453/in/photostream/ see.. on the AG site, Australian Geographic Magazine www.australiangeographic.com.au/travel/destinations/2015/... Drone photography provides an extremely close aerial view of the military fortifications and gun emplacements at Sydney Harbour's middle head. The fortifications were commissioned in 1870, after fear grew of a Russian invasion. The structure includes tunnels, cannons, gunpowder storage rooms, gun pits and underground hideaways which were also used during WWII.