The Sanctuary hall of Arantzazu is the centerpiece of a site that has been destroyed and rebuilt many times since its 15th-century origins. The current hall—completed in the 1950s after earlier sanctuaries were lost to fire and war—embodies a bold modernist vision: soaring stone walls, sculptural forms, and a dramatic interplay of light shaped by artists like Oteiza, Chillida, and Muñoz. At once austere and expressive, it stands as a testament to the Basque spirit of renewal and devotion.