An important city in a world I'm fiddling around with sits on a peninsula which sticks out into a great bay. It is the capital of a long decaying empire. The entrance to the bay is protected by two ancient castles.

While looking through the magic spell list I happened upon a spell that allows a magic user to form walls and other such objects out of stone. So I decided that the walls of these two castles look like they were grown out of living rock. This should show how much more magically rich The Empire was at one time.