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Google skipped right past the third dimension and landed directly in the fourth (time) by offering historical maps on Google Earth. Now you can travel back in time — for example, I am looking at the globe of 1790. Don't expect detailed high resolution photography from days gone by, but it's still interesting to see old maps overlaid on the satellite imagery of today.
Google Earth In 4D [blogs.zdnet.com]
And the idea of historical maps is dull on my end as well, would much rather use regular sources for history.
[edited by: encyclo at 6:07 pm (utc) on Nov. 13, 2006]
[edit reason] fixed link [/edit]
Having done something similar myself, I know how difficult it can be to overlay a historical map [webmasterworld.com] onto a satellite-perfect geographic image. Old maps were hand-drawn, often using unusual projections and grids. I overlaid about 300 maps onto Google Earth just to get approximate lat/long points for historical locations - and it took me most of the winter of 2005-2006. It was a fascinating project, though manually laborious.