Rajgir is an ancient city in the Nalanda district of Bihar, India, surrounded by rocky hills and lush valleys. Once the capital of the Magadha kingdom, it holds deep historical, religious, and archaeological significance for Hinduism, Buddhism, and Jainism.Rajgir is an ancient city in the Nalanda district of Bihar, India, surrounded by rocky hills and lush valleys. Once the capital of the Magadha kingdom, it holds deep historical, religious, and archaeological significance for Hinduism, Buddhism, and Jainism.