Even though video can never quite do it justice, this 360-degree clip from the summit of La Bajada Hill gives you an inkling of what this primitive alignment of Route 66 is like.
For a more Route 66-oriented viewpoint, go here.
The road on La Bajada was Route 66 from 1926 to 1932. It contains more than a dozen hellish switchbacks, and was so steep in spots that automobiles going uphill had to take it in reverse because gravity-feed tanks couldn’t get fuel to the engine.
Here’s a photo of La Bajada Hill from 1928: