Can’t go to space? Try Idaho. Last year, a 1,400-sq.-mi. region in the central part of the state became the first site in the U.S.—and only the 12th in the world—to be named a Dark Sky Reserve by the International Dark-Sky Association, meaning that its traits (clear air, 10,000-ft. elevation) are ideal for stargazing. Local officials pledged to take measures to limit light pollution, including shielding the tops of streetlights. —Jeffrey Kluger