The correct answer is Kamakhya Temple.

Ambubachi Mela is a significant Hindu pilgrimage that takes place annually in the premises of the Kamakhya Temple, located in Nilachal Hill, Guwahati, Assam. This festival is dedicated to the goddess Kamakhya, a manifestation of the divine feminine energy. The mela is characterized by a unique ritual where the temple is closed for three days to symbolize the goddess's annual menstruation, representing the cyclical nature of creation and destruction. During this time, devotees observe a period of abstinence and meditation. The reopening of the temple marks a time of celebration and renewal. The Ambubachi Mela is not just a religious event but a vibrant cultural spectacle with thousands of pilgrims from India and abroad participating in the festivities. Its association with the Kamakhya Temple is deeply rooted in the temple's history and the religious beliefs surrounding the goddess Kamakhya. The unique religious significance and the cultural spectacle of the Ambubachi Mela draws a large number of people every year, highlighting the temple's immense spiritual importance in Assam and beyond. The festival is an integral part of Assam’s cultural heritage.