The sky is still a deep indigo when your guide arrives in an air-conditioned van to collect you from your lodging on Mount Desert Island. The world is quiet, save for the occasional bird that dares announce the coming dawn. As you ascend toward Cadillac Mountain’s summit in Acadia National Park, the horizon begins to stir—brushstrokes of amber, rose, and gold spreading over the Atlantic and nearby islands. This isn’t just a scenic drive; it’s the first light to touch the United States each morning, a claim Cadillac Mountain holds proudly in autumn and winter months.