North India is a loosely defined region in the northern part of India. The exact meaning of the term varies by usage. The dominant geographical features of North India are the Indo-Gangetic Plain and the Himalayas, which demarcate the region from Tibet and Central Asia. North India has been the historical center of the Maurya, Gupta, Mughal and British Indian Empires. It has a diverse culture, and includes the Hindu pilgrimage centers of Char Dham, Haridwar and Varanasi, the Muslim pilgrimage destination of Ajmer, as well as world heritage sites such as the Mahabodhi Temple, Humayun's Tomb and the Taj Mahal.