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In the early days of iOS there were tons of those apps.

https://en.wikipedia.org/wiki/Geotagging#Wikipedia_article_g...

"""One of the first attempts to initiate the geotagging aspect of searching and locating articles seems to be the now-inoperative site Wikinear.com, launched in 2008, which showed the user Wikipedia pages that are geographically closest to one's current location.

The 2009 app Cyclopedia works relatively well showing geotagged Wikipedia articles located within several miles of ones location, integrated with a street-view mode, and 360-degree mode."""

https://www.peakfinder.org/mobile/

GeoImageViewer, not an overlay but side-by-side view of photograph and maps. Clicking the image anywhere (not just precalculated pois) shows corresponding location in map and vice-versa. https://hdersch.github.io/

Ah, well... To absent friends!

https://www.wired.com/2012/05/hands-on-nokia-city-lens-beta-...