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Flickr/Ryan Grayson

Where: Montana

Why: Going-To-The-Sun Road (pictured) is an apt name for the winding, 50-mile road that switchbacks up the park’s eastern slopes on its way to the 6,646-foot summit of Logan’s Pass, high atop the Continental Divide. It’s a thigh-burning ride, to be sure, but one that’s worth it for the eye-popping views of Rocky Mountain peaks, wildflower meadows and impossibly blue glacial lakes. Oh, and the amazing downhill coast on the other side. More Info

Runner-up: Crater Lake National Park, Oregon

Rim Drive, the 33-mile loop around Crater Lake, is a serene road that’s perfect to ride in fall, when the foliage flames in vivid autumn hues. More Info