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Haleakala Scenic Highway

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Maui’s Haleakalā National Park is an otherworldly place of black lava flows and giant reddish-hued cinder cones, dominated by a 10,023-foot-tall dormant volcano. SR 378, the spectacularly scenic Haleakalā Highway, climbs above the clouds to the crater (actually a valley created by erosion). The long road to the top is slow going but totally worth the adventure.
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The Haleakala Highway (SR 378) begins at the foot of the volcanic mountains that dominate Haleakala National Park. The two-lane road ascends in a seemingly endless series of switchbacks, and closer to the summit there are no guardrails; drivers should use caution. Stop at Leleiwi Overlook, 6 miles above the park headquarters visitor center; the views are amazing.