Civilizations and Structures, Explanation of:

The following are a list of all structures and each structure's explanation and rulings:

Castle
A structure specifically designed for the protection of the people of the land.

City
1,000+ people living in one community,

Town
300+ people living in one community,

Village
10+ people living in one community (if there are 1-9 people, this is not considered anything (just people living out on their own).