Loved it!!
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!