Aerial Archaeology in Northern France has low-altitude photographs of the land and the often confusing images left by past residents. Clues to ancient land registries, past structures, and landscapes changes can often be seen from above. For example, what some would label as a crop circle in the picture above was identified as the traces of an Bronze Age funerary monument.
...this site is primarily a collection of images of the many ways that the past has left its trace, of the memory of the land observed from low altitude. You must first learn to decipher these "land hieroglyphics", which at first will seem puzzling and strange.
Link -via Ursiâ€™s Blog