The Mundeshwari Devi Temple lies within the Kaimur district of Bihar. It is an ancient temple dedicated to worshipping the eternal duo of Shiva-Parvati. It is considered as one of the oldest temples in India, perhaps being as old as 625 CE. Built of stone, the temple architecture follows a rare octagonal plan. The main deities in the temple are Devi Mundeshwari and the four-faced Shiva linga. It also hosts murtis of Ganesha, Surya and Vishnu. It has been an official subject of archaeological study for some time now, dating certain inscriptions to 635 CE.