In the art world, a biennale, is a large-scale international contemporary art exhibition. The term was popularised by the Venice Biennale, which was first held in 1895, but the concept of such a large scale, and intentionally international event goes back to at least the 1851 Great Exhibition in London. The 1990s saw the boom of art biennials, a period of multiplication of this exhibition form during which art biennials grew from approximately five to over 250 internationally.