We seem to be all about the zooming in on graphics today.
A site called BigMapBlog apparently specializes in adapting old bird's-eye map illustrations of cities into Google Street View-like zoomability. They've got Fort Worth in 1891 and Amarillo in 1912, and they've got Houston for both years.
Right by the horse-drawn cart above, by the way, are the rails for the Interurban Railway, which took people between Galveston and Houston.
Hop on downtown, and after a leisurely trip through the countryside, you're in the downtown of the other city.
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Many of the street names on the maps no longer exist, so it can be difficult to locate modern equivalents, but it's still fun to try out.