The Göltzsch Viaduct stands a short drive south-east of Greiz, near Mylau in Saxony. Built in the mid-19th century to carry the Leipzig–Hof railway across the Göltzsch valley, it remains the largest brick bridge in the world.
You can walk under the arches and along the valley below; an observation point and a small café near Netzschkau give a wide view of the structure. Trains still cross it several times an hour.