Constructed by the Ordnance Survey, trig points (or triangulation pillars – if you prefer) were first put up around the UK to help with the retriangulation of Great Britain. Sounds great, doesn’t it? The retriangulation went on for almost 30 years with the aim of improving the quality of mapping.
What did this image teach me?
Sometimes (but only sometimes in my book) it’s worth climbing hills on a cold and frosty day. Sometimes.