The chaotic London street plan is another that we're hard-pressed to classify as a grid. Like any city of the Old World, London's maze of streets is an organic mix of green space, plazas, and curiously winding roads. Patches of grid can be found throughout a street map, but they don't follow any real semblance of order. Rather, they're just there because any time you want to pack a few million people into a relatively small space, the small amount of sense required to plan something efficiently will undoubtedly kick in. Cheers to utter disarray. Hey, at least you're in London.