Fortress Singapore

In the years leading to the Second World War the British prepared for a feared Japanese Invasion of Singapore. Part of this plan was to built a number of forts on Singapore's Southern Coastline to fend of a potential naval invasion. Ultimately this strategy did not pay out and the Japanese Imperial Army invaded from the North through what is today's Malaysia. Today, a  few of those places still exist. Some of them are open to the public like the Sembawang and Kay Siang Road Bunkers or the Seah Im air raid shelter. Others are an open air museum like the Labrador Battery (well, some part) and Fort Siloso. Some other like the Point 270 British Outpost require a sense of adventure and others like Fort Serapong require a permit to enter. And some sites are probably still awaiting my discovery