The “mega fortress” called Dmanisis Gora was built sometime between 1500BC and 500BC in the Caucasus region ... they used a drone to survey and map the region’s human-made features.

Researchers used drone imagery to analyze the full scope of a massive, 3,000-year-old fortress in the Caucasus mountains. Digitally stitching together 11,000 images, they created a complete map of the ...