Duke Gediminas sent one of his famous letters on January 25, 1323, as if illuminating this little-known Western European land to the eyes of Europeans and permanently placing Vilnius on the map of Europe. This day is now considered to be the birthday of Vilnius. And when Gediminas Castle is lit, it means one thing – Vilnius is celebrating its birthday, and the Vilnius Light Festival is taking place. Even the remote regions of the capital can see when the celebration starts, thanks to the crown-forming lighting fixtures on Gediminas Castle.