Unlocks the Builder ability to construct a Ziggurat, unique to Sumeria.
+1 Science. +1 Faith and +1 Culture if adjacent to River. +2 Great Prophet Points if adjacent to City Center. When you complete a special quest for each type of city-state for the first time, receives corresponding yields of the city-state`s type.
Cannot be built on Hills. Can be built on Floodplains. One per City; after respectively founding Pantheon and Religion, capital can build an additional Ziggurat; for every building of Holy Site district, city can build an additional Ziggurat.
Adacency Bonus
+1 Culture for having an adjacent river tile.
+1 Faith for having an adjacent river tile.