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 and links to a rail trail on the Highland side. Walk, bike, or run across. Open 7 am to sunset. More than 500,000 people visit the walkway each year. A Path Through History attraction.