Building or room
This building is a freestanding building when built within a town's main area. However, this same building may be built inside others, and then it is considered a room within the bigger building (Hope that's not confusing!). This could be useful, for example, so that different areas can be locked and kept private.
Object: Building or room
Days needed: 28
Raw materials needed: 25000 grams of stone
Tools needed: Trowel