Hwy. 378, also known as Haleakala Crater Road on the Hawaiian Island of Maui — one of the fastest-ascending roads in the world. This grand corniche has at least 33 switchbacks; passes through numerous climate zones; goes under, in, and out of clouds; takes you past rare silversword plants and endangered Hawaiian geese sailing through the clear, thin air; and offers a view that extends for more than 100 miles.
