This book offers an overview of the Mahajvaja Ji Temple of Eternal Fire at Surakhani near Baku, popularly known as the Ateshgah or Fire Temple of Baku. The temple complex, invariably called Jvala-Ji-ka-Mandir in the inscriptions, is in the form of a hermitage whose structure is similar to the caravanserais of the region whose walls surround a pentagonal courtyard in the centre of which sits a tetra pillar-altar. When the temple was functional, this altar in the form of a rotunda was the centrepiece of the complex where fi re rituals were performed. The altar-sanctuary itself is a four-sided construction, open on all sides, and consists of four rectangular columns, joined by arches and topped by a cupola. Surrounding the altar are twenty-four cells which used to hold the images, ascetic worshippers, Hindu and Sikh pilgrims, and merchants with their pack-animals. The extant complex appears to have been constructed over an earlier ancient structure which served as a place of fi re worship. This book is an indispensable read for students and scholars of Hindu and Sikh religious traditions, especially the history and epigraphy of Udasi Parampara.