The famous Hereford "Mappa Mundi" (Map of the World) dates from the 13th century. It is the largest (except for one) map from that period drawn on a single sheet of vellum. It was ignored for many years, then in 1855 it was cleaned and repaired at the British Museum. It shows the world as round, with the ocean all around it. It was nearly sold in the 1980s, but money was found to build a library where it could be hung. This is where it is now.