The Musée à Ciel Ouvert was built in 1972 thanks to an amibitious policy of public orders and offers you a unique journey through the business district featuring more than 60 monumental works. The Red Spider by Calder, the Fountain by Agram and the Characters by Miró are among the works at La Défense, as well as the pond by Takis, the Chimney by Moretti, the Thumb by César, the Slat by Serra.... This museum is open 24/7.