I could watch this video all day. The fluid, organic flow of people and machines [through the streets of San Francisco in 1905](http://www.archive.org/details/TripDown1905) - before the big fire. There's something mesmerizing about the way everyone is able to move together. No ring roads. No interchanges. No streetlights. No bike lanes. Just a fluid, organic flow of humanity. I lost count of near-miss collisions, though...
**Update:** Looks like the video got yanked from YouTube due to copyright issues on the audio. Awesome. So, here's the version direct from the Prelinger Archives: