The former Bankside power station consists of a huge turbine hall, a thirty-five m high and 152 m long entrance area with ramped access, as well as a display space for very large sculptural projects. Parallel to it the boiler house, where now the galleries are housed. Above the original roofline of the power station the then relatively little known Swiss architects added a two-storey glass penthouse; the lightbeam. This houses a café-restaurant with stunning views of the river and the City, and the lower a membersroom with terraces on both sides of the building. The chimney was capped by a coloured light feature designed by the artist Michael Craig-Martin, known as the Swiss Light. The redevelopment of the redundant Bankside Power Station is a key to the regeneration of the area. Tate Modern is the national gallery of international modern art. Located in London, it is one of the family of 4 Tate galleries which display selections from the Tate Collection.