I like the concept. I would however stay away from Auto white balance and Auto exposure. You can see a dramatic shift of both in the first couple minutes. A few shots were a bit dark (the shot of the harbor comes to mind where auto exposure is taking in too much of the sun on the water) so use manual exposure to get a good exposure on your subject, then fly your shot. There was one transition that was a bit jarring where it looked as though you stopped shooting for a second then resumed but the drone had moved a little bit.
It was interesting enough to keep my interest for the entire time, but as
@Phantomrain.org says, it moves pretty fast for most people. IF there is a tempo for the narration, perhaps slow it down a bit and pick and choose to fit what you can in the video.
I liked it though, I know it represents a lot of work on your part in digging up the history, the images and researching it all. I look forward to the next one!