This footage is filmed around 1900 in the cities of London, England, and Cork, Ireland. However, it doesn't look like any 100-year-old film you've seen, because it's been altered to make it more like being there than the film technology of the time could produce.
This video has been dramatically enhanced in quality, using modern video editing tools. The film has been motion stabilized and the speed has been slowed down to correct speed (from 18 fps to 24 fps) using special frame interpolation software that re-creates missing frames. Upscaling to HD quality was done using video enhancer software.
(via Nag on the Lake)