Campo Imperatore is the immense high plateau on the southern side of Gran Sasso, often nicknamed Italy's little Tibet. The name is overused, but the comparison makes sense when the road opens onto a treeless basin of grass, rock, wind, and distant ridges.
It is the main southern access point for hikes toward Corno Grande and for winter skiing when conditions allow. Even if you are not hiking, the drive is worth it in clear weather; bring warm layers, because the plateau rarely feels as gentle as the valleys below.