If you want to watch sunrise from the national park at the top of Mount Haleakala, the volcano that makes up around 75 percent of the island of Maui, you have to make a reservation. Being at 10,023 feet, the summit provides a spectacular—and very popular, ticket-controlled—view. Just about a mile down the road from the visitors’ center sits “Science City,” where civilian and military telescopes curl around the road, their domes bubbling up toward the sky.

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