Nagyerdő, Debrecen, Hungary, between 1890 and 1900. Nagyerdő, meaning "Big Forest", is the central park in Debrecen, Hungary's second largest city. Photochrom by the Detroit Publishing Co.
The original scan was not particularly good, but I think it came out fairly well, though full resolution is a bit blockier than I think it really would have been. Restoration was mainly down to a slight colour tweak, and fixing of frequent damage.