Denali Highway (Alaska Route 8) is a lightly traveled, mostly gravel highway in the U.S. state of Alaska. It leads from Paxson on the Richardson Highway to Cantwell on the Parks Highway. Opened in 1957, it was the first road access to Denali National Park (then known as Mount McKinley National Park). The Denali is 135 miles (217 km) in length.

Photograph via ramcquade
12. Karakoram Highway, China/Pakistan
The Karakoram Highway (KKH) is the highest paved international road in the world. It connects China and Pakistan across the Karakoram mountain range, through the Khunjerab Pass, at an elevation of 4,693 m/15,397 ft. It connects China’s Xinjiang region with Pakistan’s Gilgit–Baltistan and Khyber Pakhtunkhwa regions and also serves as a popular tourist attraction.

Photograph by bjapuri (Ed Sentner)
Due to its high elevation and the difficult conditions in which it was constructed, it is also referred to as the “Eighth Wonder of the World.” The Karakorum Highway is known informally as the KKH, and — within Pakistan — officially as the N-35; within China, officially as China National Highway 314 (G314).