Buddhist monuments like the stupas are among the earliest monuments to be found in India, going back to 230-500 B.C. At Nalanda, southeast of Patna in Bihar, excavations have revealed temples, monasteries, cells and libraries, and statues. Near Aurangabad in Maharashtra, about 30 rock-caves – famous as the Ajanta caves – contain delicate carvings and frescoes, which are still colourful. At Bodha Gaya in Bihar, a decorative railing and a stupa portray medieval architectural styles. At Sarnath in Uttar Pradesh, Emperor Ashoka, who had embraced and promoted Buddhism, had raised the first of the famous Ashokan pillars. Sanchi in Madhya Pradesh has a massive stupa with marvellously carved gateway and railings. Kushinagara in Uttar Pradesh is another site where Ashoka had erected a pillar and constructed a stupa. The principal stupa has a large hemispherical dome topped with a small balcony surrounded by three umbrellas. A stone casing was added to the original structure sometime later, and two smaller stupas and an impressive carved gateway erected.  It was visited by Huien Tsang in the 7th century! In Ladakh, there are gumphas or monasteries, for example, at Leh, Lamayarn, and Spituk.