Masonry (CivRev)

Masonry

Technologies required	Pottery
Technologies enabled	None
First development benefit	Free Walls in one city
Renders obsolete	Nothing
Great people	None
Governments available	None
Units available	None
Buildings available	Walls
Resources available	Marble
Wonders available	Great Wall

Masonry allows the building of city walls. If the player's civilization discovers Masonry first, city walls are automatically built in the player's most important city, usually the capital.

Masonry also allows civilizations to collect Marble resources, as well as construct the Great Wall, which allows them to demand peace from their enemies.