The warlock Pyat Pree persuades Daenerys Targaryen to seek answers in the House of the Undying. Inside, she passes through many rooms containing visions before she reaches the chamber of the Undying.[2]
A beautiful, naked woman being ravished by four of the dwarves who serve the house.
A feast of slaughtered corpses holding cups, spoons, and food, with a dead man with a wolf's head sitting on a throne wearing an iron crown, apparently foreshadowing the Red Wedding.
Daenerys' childhood home in Braavos.
A throne room with dragon skulls on the walls where a king resembling Aerys II Targaryen sits on a barbed throne.
A room where a silver-haired man (presumably Rhaegar Targaryen) names his son Aegon, says the child is the "prince that was promised", then plays a harp.
A "splendor of wizards" who falsely claim to be the Undying of Qarth and offer to teach Daenerys the secret speech of dragonkind.
Upon reaching the chamber of the Undying, Daenerys is spoken to in a barely perceptible whisper. The Undying call her "mother of dragons" and "child of three" and tell her some prophesies, saying "three fires must you light... one for life and one for death and one to love... three mounts must you ride... one to bed and one to dread and one to love... three treasons will you know... once for blood and once for gold and once for love..." The Undying show Daenerys many more visions before attacking her. [2]. They are slain by Drogon.
House of the Undying - A Wiki of Ice and Fire