Bodh Gaya is a religious site in Bihar, India and a place of pilgrimage for Buddhists. It was here under the Bodhi tree where Siddhartha Gautama is said to have attained enlightenment. In the 3rd century BC, Emperor Ashoka built the Mahabodhi Temple at the site to commemorate this event. The Mahabodhi Temple complex was designated a UNESCO World Heritage Site in 2002 and remains an important pilgrimage destination for people of the Buddhist faith from around the world.