Isle of Sark, U.K.
The Isle of Sark is a 2-square mile (5-square km) jurisdiction in the English Channel, the third-largest of the Channel Islands and a crown dependency of the United Kingdom. Designated in 2011 by the International Dark Sky Association as the first Dark-Sky Island in the world, with skies rated at class 3 in the Bortle Scale, the island is home to the Sark Astronomy Society (SAstroS) and Observatory. There are no airports and the island is a car-free zone, but Sark is accessible via ferry boat from Guernsey and accomodations are available. SAstroS hosts annual Starfest celebrations—the first having occurred in October 2011; they generally occur in the autumn or spring to mark both the beginning or end of winter.