Lost Mine of Phandelver
Cragmaw Castle was a castle raised by a noble of old Phalorm but since then has fallen into disrepair. It now consists of seven overlapping towers and with its upper levels all but collapsed into heaped masonry,
At some point the Cragmaw Tribe took control of the ruins as one of their many goblinholds. From there, a Goblin King rules the other chieftains of the Cragmaws with an iron fist.