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A red-and-white treehouse rests among the misty trees of North Shore, Minnesota. A tent, bicycle, map, and compass sit nearby, with a wooden sign marked “49.” Fog drifts through the valley around a large rock.

A red-and-white treehouse rests among the misty trees of North Shore, Minnesota. A tent, bicycle, map, and compass sit nearby, with a wooden sign marked “49.” Fog drifts through the valley around a large rock.