florida isn't exactly known for awesome progressive acts, but one of the few cool things to happen there was the cancelation of a cross-state barge canal (canceled for environmental reasons!) the canal was to run from the atlantic coast to the gulf coast, across the north-central part of the state, to cut travel costs and time for barges. it was funded in the 1930s and construction began, only to be stopped and restarted many times until the project was officially canceled in 1991.
the best part is, the entire length of the route is now a protected greenway that spans a mile across almost the entire way.
several of the supports for a bridge over the canal are located just outside my hometown, in santos. these particular supports date back to the original go-ahead in 1935.