Location from A Song of Ice and Fire by George R.R. Martin
A titanic drum tower on the cliffs of Shipbreaker Bay, built with spells woven into its walls that no storm — natural or magical — has ever breached.
Storm's End was built by Durran Godsgrief to defy the storm god, and whether or not the legend is true, the magic in those walls is real — Melisandre's shadow assassin could not pass through them until smuggled beneath by boat. The castle has withstood every siege in history, including Stannis holding it through Robert's Rebellion while his garrison ate their horses, then their dogs, then their shoe leather. Davos Seaworth broke the siege with a hold full of onions and earned a knighthood and shortened fingers for his trouble. The storms that hammer the walls are constant and violent, and the crash of waves against Shipbreaker Bay is a sound that never stops — defenders either learn to sleep through it or go slowly mad.
A single massive round tower rises from cliffs battered by endless storms, its walls a hundred feet thick at the base and smooth as glass. No window faces the sea. The curtain wall is so huge it dwarfs every other castle's fortifications, and the tower behind it seems to challenge the sky itself.
Also known as: Storm's End, the Baratheon seat