The Mercedes-Benz Superdome, previously known as the Louisiana Superdome and colloquially known as the Superdome, is a sports and exhibition arena located in the Central Business District of New Orleans, Louisiana, USA. Plans were drawn up in 1967 by the New Orleans modernist architectural firm of Curtis and Davis. It is the largest fixed domed structure in the world. Its steel frame covers a -acre ( ha) expanse. Its -foot ( m) dome is made of a Lamella multi-ringed frame and has a diameter of feet ( m).