The Mercedes-Benz Superdome (originally Louisiana Superdome and commonly The Superdome) is a domed sports and exhibition venue, 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. Its steel frame covers a 13-acre (5.3 ha) expanse. Its 273-foot (83 m) dome is made of a lamellar multi-ringed frame and has a diameter of 680 feet (210 m), making it the largest fixed domed structure in the world.