The Castlefield Viaduct is a short but vital 'sky garden' amidst a tangle of railway lines, bridges, and viaducts in the oldest part of Manchester. The 330m long Grade II-listed viaduct (1892) carried trains from the old Manchester Central Station until 1969. It remained closed and out of bounds until taken over by National Trust; work has been under way since 2022 with plans to extend the 150m walkway along the full length of the viaduct.