25. To combat the threat of desertification of the Sahel (the region immediately to the south of the Sahara), the African Union is leading an initiative to plant the Great Green Wall, a 7,775 km (4,830 mi) belt of trees crossing the entire breadth of North Africa
28. All roads lead to Rome. This map visualizes the famous roads built by the Roman empire. I have removed the land to highlight how far this empire spread its infrastructure.