An official Path Through History Site! The Hudson Valley's most unique state park, Walkway Over the Hudson State Historic Park is the world's longest elevated pedestrian bridge (1.28 miles). The bridge spans the majestic Hudson River, offering awesome views of the Hudson Valley. The linear park, 212 feet above the river, was created on an abandoned railroad bridge originally opened in 1889 as the Poughkeepsie-Highland Railroad Bridge. Conceived in the late 1860s to connect Pennsylvania's coalfields with New England's industries, when opened the 6,768-foot span was considered the world's longest bridge and an engineering marvel. Today the Walkway links to a rail trail on the Highland side. Walk, bike, or run across.