The castle in the depth-psychology corpus occupies a remarkably polyvalent symbolic register, functioning simultaneously as mandala, anima-dwelling, initiatory threshold, and psychic fortress. Jung himself uses the castle as a primary image for the individuation center: his painted mandala of a golden castle—coinciding synchronistically with Wilhelm’s transmission of the Secret of the Golden Flower—anchors the motif to the Self as architecturally expressed totality, a fortified center surrounded by moats and walls analogous to the Imperial City in Peking. Von Franz reads the fairy-tale castle as a psychic inheritance, a locked potential awaiting developmental readiness (the key given before the castle appears), while also noting how the Wotanic anima inhabits the remote castle of the unconscious. In the Grail romances analyzed by Campbell, the castle bifurcates into two reciprocal poles: the Castle of the Grail (awe, spiritual wounding, the Fisher King’s sterility) and the Castle of Marvels (the Realm of the Mothers, enchantment, the unconscious feminine). Auerbach situates the Arthurian castle at the intersection of fairy-tale timelessness and ethical topography, noting that the right road leads invariably to the right castle. Estés employs Bluebeard’s castle as the psychic site of predator and forbidden knowledge. Freud’s dreamwork treats the castle as a locus of authority, military command, and thanatic anxiety. The term thus traverses clinical, mythological, alchemical, and literary registers with consistent depth-psychological gravity.