Unique Improvement: Castrum (Rome)

Adds unique graphics and bonusesfor the Roman Fort, which has been renamed to "Castrum". The graphics include a version with wooden palisades and tents for the classical era and a stone version for the medieval era and beyond. Further, some decorative elements outside the walls of the fort itself are only visible if the tile is worked by a citizen. To make the improvement a bit more worthwhile to build, the Castrum also gets +1 Culture per leve of Walls in the city, +1 Production, and +1 Housing. The Castrum will also give Tourism equal to that Culture once the Flight technology is unlocked (just like all other improvements). For more gameplay bonuses for Forts, including the Castrum, I recommend Castles - Better Forts. Requires Rise & Fall and Gathering Storm (uses some artwork from the Tsikhe, Maori Pa, and Cahokia Mounds). Compatible with Civilizations Expanded. Special thanks to Sailor Cat who let me use art from the fantastic Watchtowers mod. JNR's Mod Series