The Internet Archive has a phenomenal collection of digitized early film. This one is of the aftermath of the San Francisco earthquake of 1906.
It consists of 5 minutes and 13 seconds of of people traveling through the rubble and viewing the devastation. One of the most interesting things from my perspective is that 1906 was in the decade in which the automobile began making inroads into American cities. There are shots of people walking, cycling, riding in horse drawn carriages, and in automobiles, often in the same shot.