British Museum
Cameo; opaque red; Period: Late Byzantine circa: 13 thc. Materials: glass. Made in: Venice. The Crucifixion with St John and St Mary and inscription, in relief. British Museum is closed 24, 25 and 26 December and 1 January, but is open every other day of the year. Fast facts about the British Museum: Founded: 1753, Collection size: 8 million objects, Oldest object in the collection: Stone chopping tool (nearly 2 million years old).