On Weathertop was the Tower of Amon Sûl, a watch-tower built by the kingdom of Arnor. Oneof the "palantíri" was kept in the Tower. In T.A. 1409 the Tower was destroyed, and only ruins were left. In October T.A. 3018, Aragorn and the hobbits camped on Weathertop and were attacked by the Ringwraiths; Frodo Baggins was wounded by a Morgul-blade.