The History Cycle

Here in the U.S., there's Rails to Trails, in which old rail lines have been turned into bike paths. In Europe, there's the Iron Curtain Trail, which is exactly what it sounds like ~ a bike path along the Soviet-created border between western Europe and the USSR and its captive "satellite" countries (story, link to audio version): http://www.pri.org/stories/2014-07-30/it-was-once-worlds-most-important-political-border-now-its-bike-path