Most long-lasting stone structures are in constant decay. Without being weather sealed and maintained, they will decay and fail. Even if they are in moisture and vegetation free environment like the pyramids, they are still subject to that most basic human trait - theft.
Most long-lasting stone structures are in constant decay. Without being weather sealed and maintained, they will decay and fail. Even if they are in moisture and vegetation free environment like the pyramids, they are still subject to that most basic human trait - theft.