Apart from the artworks on display, the interior architecture of the Louvre is also worth viewing especially the rooms in the 18th and 19th century wings. Several 19th century courtyards were roofed over during the reorganisation proposed by I.M Pei. These roof constructions were designed by G. Duval, M. Macary, and Jean-Michel Wilmotte. The courtyards now provide some massive internal spaces for the display of large sculptures and architectural remnants.