Rear facade by Jean Cortonne. The terrasse is slightly higher than the garden level, as the area was a swamp in the 18th century. Each prime minister is planting a tree upon installation at Matignon. Manuel Valls' oak, 2014. Dog grave from the time when Matignon was used as the Austria-Hungary embassy. Alley of linden trees, designed in the mid-18th century, current trees from 1950. Ice cave. Labels