I picked the United Kingdom for Twilight as it is the country most associated with both magic and science. As for Ireland, I didn't want to separate Spike from his big sister/mother :)
Ireland — Dragons are a big part of Celtic mythology. www.deviantart.com/dashiespark…
England — The British Library is home to more books than any other library in the world. www.deviantart.com/90sigma/art…
Northern Ireland — It is historically known for its industry and engineering, which fits Twilight's science-y side. www.deviantart.com/jhayarr23/a…
Scotland — It's national animal is a unicorn. www.deviantart.com/puetsua/art…
Wales — It has most castles than any other country in Europe + it's home to Gladstone's Library, the United Kingdom's only residential library where you can sleep among the books. www.deviantart.com/luckreza8/a…