Joshua Tree National Park

Zion National Parks red rocks

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The Milky Way shines above the ocean off the coast of Acadia National Park in the early morning hours of Monday, April 23, 2018. Night skies in northern Maine consistently place first in a rating of darkness, meaning there is less light pollution and allowing more stars and planets to be seen. Parks like Acadia, Katahdin Woods & Waters National Monument as well as the Appalachian Mountain Club, which has land holdings in the 100-mile wilderness area, are hoping to boost astrotourism by becoming receiving a dark-sky designation from the International Dark-Sky Association. (Staff photo by Gregory Rec/Portland Press Herald via Getty Images)

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Glacier National Park

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Joshua Tree National Park

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