The serial property comprises of Alamūt Castle and six associated fortifications—Lambesar, Navizaršāh, Šams Kelāyeh, Qosṭinlār, Širkūh, and Ilān—strategically positioned within the rugged landscape of the Alborz Mountains in Qazvin Province, northern Iran. From the late 11th century CE, Alamūt served as the political, military, and intellectual centre of the Nezāri Ismaʿilis, an influential Islamic movement whose reach extended across Iran and the wider Islamic world. This fortified network functioned both as a refuge and as a scholarly and cultural hub, sustaining the Nezāri community until the fall of Alamūt in 1256 and continuing to shape regional religious and intellectual history long thereafter. Together, the fortifications illustrate the strategic organisation, resilience, and cultural significance of the Nezāri Ismaʿili state.