Mulholland Drive — HollywoodHills.

Mulholland Drive is Los Angeles's great contradiction: a 21-mile ridge road above one of the most congested cities on earth that offers, on a clear morning, 40-mile views from the Pacific to the San Gabriel Mountains and absolute solitude above the canyon fog. The stretch from Laurel Canyon to Kanan Dume is the famous sportbike corridor — tight, technical, demanding second- and third-gear canyon carving above Beverly Hills. It's not the safest road on this list, but it's the most alive.