WATCH: Britain's heat wave reveals surprising historical secrets

Ancient farmsteads, roads and boundaries have shown up under seemingly ordinary fields, as the heat wave has thinned out the growth in the fields.

Taking to the sky, aerial archaeologists are able to see the boundaries and lines of ancient settlements, up to now hidden even from the farmers who live in the area.

It's been a blistering hot and dry summer in the United Kingdom, as the drone footage of this depleted reservoir below shows.