Frostfound
"Towers and ramps and galleries and stairs of ice, raised and spun like an architect's honey-dream. No spider ever wove so complex a web. The towers are utterly pristine, untouched by human life, but a pitiable encampment squats by the dock."[1]
Frostfound is a castle of ice located in the northern Unterzee.
I Still Have My Question
Every year the people of Irem and Whither meet here for contests; they are trying to determine the difference between a question and a riddle. Those who prove themselves in the contests can enter the castle, which is sacred ground - but nobody has been deemed worthy yet.[2][3]
Let It Go...?
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"Light! A hundred rich and blinding colours filter through the ice. It's like drinking a kaleidoscope. It's like being kidnapped by rainbows. The colours shift with every step you take, revealing shining corridors. In each and every corridor, your reflection waits."[4]

Frostfound consumes its visitors' memories and stories, slowly degrading their minds. But then again, sanity is the cardinal price of knowledge.[5]
The castle was built long ago using the memories of a Traveller who went East; the corridors of Frostfound are implied to have been shaped by their past life.[6][7]
The Corridors of Frostfound
- The Sapphire Chamber: "THIS WAS THE SKY" - a chamber dedicated to the High Wilderness and the hunger of the Stars.[8][9]
- The Amethyst Gallery: "THERE WERE CASUALTIES" - a gallery filled to the brim with dead sky-behemoths, more vast than imagination permits.[10][11]
- The Cavity: "THIS IS ONLY A MEMORY. THE CRIME IS FORGOTTEN. ITS SHADOW REMAINS" - a chamber dedicated to the terror and pain of the Red Science.[12][13]
- The Emerald Vista: "SOMETHING SOUGHT, SOMETHING LOST" - an infinite depth of secrets and changes, with the strength of an unstoppable flood.[14][15]
- The Diamond Bridge: linking the towers of Brite and Teneb, this bridge is bathed in the merciless light of the stars, bright as humiliation.[16][17]
- The Iridescence: "KNOW YOURSELF" - a foggy chamber where one must confront and understand themselves.[18][19]
- The Dark Room: the very center of Frostfound,[20] at once a caul and a coffin,[21] containing the secrets of the gods and the name of the castle's creator, written in their own blood.[22][23]