Show HN: CityFlashback – Explore your city through historical photos

This is a cool idea! I think you need to find a way to seed more photos (are there any public archives by country/state you could use?), but I could see this being useful when traveling as a way to understand the history of a place.

Somewhat related, but made me remember Color Labs (https://en.wikipedia.org/wiki/Color_Labs) which tried to build a social network where you could see photos taken by other people in your location.