What is the shape of Britain? The country's outline, looking a little like a wingless dragon, is instantly recognisable on any map or globe. But jostling within that familiar profile are countless vying maps of the country. Some of these are founded on rock - or on the natural features of the land. But far more are built on dreams - on human activity, effort, and aspiration. Britannia Obscura is an exploration of just a few of these surprising hidden Britains.