Winterfell is the ancestral castle of House Stark and the political capital of the North. The castle was built over a natural hot spring, whose scalding water runs inside the castle walls and warms its halls and rooms as well as the glass garden at its northwestern corner. There are several open pools where heated water collects within the godswood. The hot spring also prevents the ground from freezing. The castle has deep catacombs called "the crypt", where bodies of deceased Starks are entombed behind statues in their likeness with a direwolf at their feet and their swords in their hands. The tombs have been used since the old kings of the North, known as the Kings of Winter, were in power. They ruled since before the arrival of the Andals.