Aerial surveying is an important technique used in archaeology, providing a new perspective on large sites or features that are hidden at ground level. From an airplane, the bird's eye view can provide clues about ancient foundations buried beneath the surface by analyzing the soil color, growth of vegetation and even shadows cast by protruding objects or uneven ground. Many of the photographs taken during aerial observation reveal evidence of how our ancestors lived, and the photographs taken before World War II are particularly valuable as many historic sites were plowed through after the...