Advanced production improvement. Requires Masonry. * Constructed on: * Stone bonus resource * Access: * Marble luxury resource * Effect: * +1 Image:20xProduction5.png Production * +1 additional Image:20xProduction5.png Production after researching Chemistry * +2 Image:20xfaith5.png Faith with Stone Circles Religious belief * +1 additional Image:20xProduction5.png Production with Five-Year Plan Order tenet