The MacIntosh Forts are a group of seven observation posts built in Hong Kong between 1949 and 1953 at the border with China, to safeguard the border against illegal immigrants, when there was an influx of refugees from China due to political instability. The Forts were named after Hong Kong Police Commissioner Duncan William MacIntosh (in office, 1946-1953) who decided to build a chain of observation posts guarded day and night. They have been listed as Grade II historic buildings since 1997. (quote from Wikipedia)
There is a path at right hand side along the chain link fence, follow it to Lo Shue Ling 老鼠嶺.