Malibu Sandy Hill, California

9000 Pacific Coast Hwy, Malibu, CA Driving north up PCH, you'll see the sand dune on the east side after passing by Sycamore Canyon/Sycamore Cove Beach and before reaching the entrance to the Thornhill Broome Campground. Park on the shoulder off of PCH. There's plenty of room, though you may be partially parked in the sand. You can also park on the beach side of PCH but rather than taking your life in your hands jaywalking across PCH, you're better off parking on the mountain side of the highway. The mysteriously large sand dune is the result of "Aeolian transport," or the wind's movement of particles, in this case, sand. Quite steep this hill is, but your effort will be rewarded with some beautiful views of the Pacific Ocean. Plus, you get a nice bird's eye view of Mugu Rock.