Tower of Joy

Rhaegar Targaryen chose this round tower, tucked into the foothills of the Red Mountains, to leave Lyanna Stark there while he rode off to war. Three heavyweight names of the Kingsguard kept watch over her: Ser Arthur Dayne, Ser Oswell Whent, and the Lord Commander himself, Gerold Hightower.

With Rhaegar leading the crown's army against the rebellion led by Robert Baratheon, the tower became the one fixed point in Lyanna's life for those months: three swords standing guard in a corner of Dorne almost nobody knew about.

By the end of the war, Eddard Stark reached the tower with six men and came face to face with the three knights guarding it. Only Eddard and Howland Reed walked away from the fight.

Inside, Eddard found his sister dying. Before she died, Lyanna made him swear a promise. Once it was over, Eddard had the tower torn down and raised barrows for the companions lost in the fight.