It is good to see tax dollars put to good use, even if it by accident.
The U.K. government has been conducting LIDAR scans of the country. LIDAR is a powerful laser scanning tools that can see past vegetation and thin or soft soils revealing the ancient landscape beneath. Aside from its legitimate purposes of flood control and coastal erosion observation this has revealed a lot of ancient works that have laid hidden for centuries such as Roman roads and forts. Some enterprising souls have gone through the massive amount of data and discovered all sorts of cool stuff like forgotten Roman forts.
A fun way to waste some time, and get a very detailed idea of what real terrain looks like.