The All Streets map visualizes of all the 240 million individual road segments in the United States. Although no other features — outlines, cities, or types of terrain — are marked, canyons and mountains emerge as the roads are layed around them. Roadless terrain forms the topography of the Appalachian Mountains. San Francisco. A detail of the West Coast shows the scarcity of roads in mountainous areas, punctuated by the densely populated Bay Area. Get your copy for only $30. Created by Fathom.