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Microsoft world imagery database. Create photographic maps of any place in the United States as well as several major world cities using satellite images and aerial photographs.
Interactive web site with topographical maps for the United States.
Uencounter.me is a virtual pin map that is social. We've recently introduced a 'genealogy' pin that allows you to pin ancestral information on your map. By linking with other users, you can share the map and overlay it with others to identify common locations.
WhatWasThere ties historical photos to Google Maps. The premise is simple: provide a platform where anyone can easily upload a photograph with two straightforward tags to provide context: Location and Year. If enough people upload enough photographs in enough places, together we will weave together a photographic history of the world (or at least any place covered by Google Maps). So wherever you are in the world, take a moment to upload a photograph and contribute to history!