Market houses are a notable feature of many Northern Ireland towns; their varying styles of architecture, size and ornamentation make for a most interesting feature of the streetscape. The market houses were designed with three, four or even five bays on the ground floor which were an open arcade. An upper floor was often used as a court house or ballroom. Ornamentation consisted of a cupola, a clock or sometimes a dome or tower. Today most of the market houses in Ireland have been put to use as cultural venues or business premises. Some are still derelict.