Ancient castle at the mouth of the White Knife, raised by a Stark king of old to guard the river against raiders from the sea. It is far older than the city of White Harbor that grew up around it, and it has passed through many hands (Greystarks, Flints, Lockes, Slates, and others) before the Manderlys came to hold it for Winterfell.
The Gaol
The lords of White Harbor keep the Wolf's Den now as a prison, its damp cells housing smugglers, debtors, and worse. Old iron and older stone make it a hard place to leave unbidden.
The Old Godswood
Within its walls grows a godswood of tangled trees, ruled by a heart tree of monstrous size with a face grim and terrible. Men say the old gods watched dark deeds done beneath those branches in ages past.