A footnote about using different dates of Google images, I'm sure many know this but some may not have thought of it: A lot of times the displayed images are taken in warm weather, with plenty of tree cover hiding the roads or trails, so I've often had better luck when I go back in time and pick an image taken in the winter. Doesn't help with conifers-- or buildings in Columbus or Houston. (There's a height limit in DC which improves your chances of seeing all the streets.)