Fort Glanville Conservation Park is a protected area located in the Australian state of South Australia located in Semaphore Park, a seaside suburb of Adelaide consisting of a functional 19th century fort listed on the South Australian Heritage Register and some adjoining land used as a caravan park. The fort was built after more than 40 years of indecision over the defence of South Australia. It was the first colonial fortification in the state and is the best preserved and most functional in Australia. Fort Glanville was designed by Governor Major General Sir William Jervois and Lieutenant Colonel Peter Scratchley, both important figures in early Australian colonial defence. When built it was designed to defend both Semaphore's anchorage and shipping entering the Port River from naval at