The rural ones are a lot harder. I'm on one somewhere in Australia (I only know that because the was a sign that had Australia on it), on a single lane road with no signs other than that one that had Australia on it. There was one other sign, but whatever it said was blurred out. Thanks, Google.
There was another one that was some resort in Maui (on foot), and in every frame there's a cop escorting the Google guy off the property, lol.
I've been a little luckier with villages & towns, though they are in South America and Eastern Europe. I've had a few guesses that were in the 25-50 meter ranges. A very addicting game. &%#^ you, Runnah!!