I would call that a megalith, and not to be cute but to give a sense of scale which is useful. I think there is a point in which a monolith grows so big that is

I would call that a megalith, and not to be cute but to give a sense of scale which is useful. I think there is a point in which a monolith grows so big that is painfully obvious that size became an obstacle greater than the benefits. Pain tolerance differs so the label gets applied at different sized monoliths.