Mark Esper spent one and a half years drawing a map of Great Britain, Ireland and the dependencies (Isle of Man, Channel Islands). He describes how he did it in this blog post. “In its finished form, this map contains over 280 cities, as well as a countless number of castles, ruins, and other buildings scattered over the map.  All 21 National Parks are labeled, 12 different languages are present: English, Guernésiais, Jèrriais, French, Auregnais, Serquiais, Cornish, Manx, Irish Gaelic, Welsh, Scots, and Scottish Gaelic, and all major bodies of water are labeled.” He’s selling it as a 24×36-inch print. “In the future, I plan on continuing to draw countries, states, continents and other regions of the world in a similar level of detail.”