Awesome melding of two of my favorite websites! Who'd have thought you could bring them together. Great choice of locations and difficulty progression. The first ones were easy, then I had to turn on hybrid mode, then start consulting Wikipedia. In the end, one of them was unidentifiable to me. I trust it is really famous. :)
Only reason I didn't give 10/10 is I would also have liked a little reward for finding each place. Ground-level photo of it or fun fact or something. Also would be cool if you got bonuses for finding a place without turning on hybrid, or for jumping multiple zoom levels at a time, or fewest number of clicks. Overall cool new game concept!