4. PACIFIC COAST HIGHWAY, CALIFORNIA
It travels the whole length of California close to or right on the Pacific Coast, but the most striking and scenic stretch is along California Hwy. 1 between Monterrey and Morro Bay, south of Carmel. here, it is tight along the cliffs with sheer dropoffs by the water. This stretch was built and paved in the 1920s and 1930s by convict labor.
The Big Sur area is particularly inspiring, especially at the single-span concrete Bixby Creek Bridge, quite the feat of engineering.
By San Simeon, the terrain has leveled off, but here visit the Hearst Castle, built by newspaper baron William Randolph Hearst.
I went on it way back in 1967 with my parents. I should try to get back there some time.
Pretty Inspiring. --RoadDog