Entrance vaults at the Riverside Church in Manhattan by the Guastavino Company. The Guastavino Company was able to integrate its vaulting into the steel framing, so that the loads were shared between the two systems. Though this made the vaulting seem decorative rather than essential, the vaulting was in fact load bearing and part of the building's structural system. Photo © Michael Freeman, Courtesy of the Museum of the City of New York