Shimla is the capital and largest city of the northern Indian state of Himachal Pradesh. In 1864, Shimla was declared as the summer capital of British India. The climatic conditions attracted the British to establish the city in the dense forests of Himalayas. The colonial architecture and churches, the temples and the natural beauty of the city attract a large number of tourists. The major attractions include the Viceroy Lodge, the Christ Church, the Jakhoo Temple, the Mall Road and the Ridge, which together form the city centre. The Kalka–Shimla Railway line built by the British, a UNESCO World Heritage Site, is also a major tourist attraction. Owing to its steep terrain, Shimla hosts the mountain biking race MTB Himalaya, which started in 2005 and is regarded as the biggest event of its kind in South Asia. Shimla also has the largest natural ice skating rink in South Asia.