This project is inspired by OldSF.org.
Disclaimer: We are not affiliated with Amsterdam City Archives/beeldbank
The source of the images is Amsterdam City Archives/beeldbank.
We used public API provided by that service to aggregate collection of photos and geocoded each photo to put them on Google Maps.
We have ~ 1/5 of the content available on the web site and are working on improving geocoding mechanism to put another part for areas like Amstelveen and others.
If you want to know more, we've recently published the whole process on Medium OldAms.nl — the process of creating the largest collection of historical photos of Amsterdam on map.
Also, the source code is available on GitHub.