深圳河
The MacIntosh Forts were built along the Sham Chun River when an influx of Chinese refugees was followed by border incidents of armed clashes between the police and refugees. Amongst the refugees were the defeated remnants of the Kuomintang Nationalist armies and also a "fair number of common criminals". The Forts were built in reinforced concrete of the same style and of very similar design, which may be categorized as Modern Utilitarian. Built on hilltops at strategic spots, with a view across the border, they were dubbed the "Macintosh Cathedrals" because of their distinctive appearance and outline against the skyline. Six out of the seven Forts are now remotely controlled. They are not open to public.