NamibRand International Dark Sky Reserve
Credit: Wolfgang Steiner / Getty Images

Combine a safari with stargazing at this reserve in the southern African nation of Namibia, among the most sparsely populated countries on Earth. Barentine says the site is "perhaps the darkest location IDA has ever designated." The skies above the reserve's 770 square miles of land, he added, are "as close to 'natural' darkness as one can obtain in the world."