Even though the population is predominantly Muslim, there are some equally intriguing religious monuments of other faiths. The Digambar Jain Temple, a place of worship for adherents of the Jain faith, is a tranquil oasis amid the chaos and is the oldest Jain temple in Delhi, its simplicity being its main attraction. There is a bird hospital attached to it where sick and injured birds are taken care of, though the odors can be quite overwhelming! The Gauri Shankar Temple, fringed with heaps of marigolds sold to people going in to pray, has an 800-year old lingam, a stylized phallus worshipped as a symbol of the Hindu Lord Shiva. Another interesting stop is the Sisganj Gurudwara of the Sikhs, where Shah Jahan's tyrannical son, Aurangzeb, beheaded the ninth Sikh Guru, Guru Tegh Bahadur.