Mary Ann Ochota @MaryAnnOchota is a TV presenter, anthropologist, lover of the outdoors, people & the past. Royal Geographical Society Fellow, Ordnance Survey Champion, and Climb Britain Ambassador. Her latest book, Hidden Histories: A Spotter's Guide to the British Landscape is out now.
Producer: Dan Morelle
Part 1 & 2 of Dan Snow's new 3-part series, Operation Gold Rush is available to stream on iPlayer now and continues this Sunday on BBC Two at 8pm.