India is the seventh largest country by area and the second most populous country in the world. Four major world religions originated in India - Hinduism, Buddhism, Jainism, and Sikhism. Hinduism is the dominant religion and emphasizes dharma, rituals, and mystical practices. Buddhism teaches that one can achieve enlightenment by practicing mindfulness and letting go of desires. Famous historical sites include the Taj Mahal, a mausoleum built by Shah Jahan for his wife; the Mahabodhi Temple, a 2000-year old Buddhist temple; and Nalanda, an ancient university established in the 5th century CE. Common greetings in India include saying "Namaste," which means paying respects