The document discusses different types of shelters used in various regions of India based on environmental conditions. It describes the Bhimbetka rock shelters in Madhya Pradesh which contain ancient paintings over 9,000 years old that provide insights into the lives of early humans. It also discusses sloped roofs used in hilly areas to allow snow to easily slide off without damaging the roof. Stilt houses built by tribes in the Nicobar Islands and believed by the Mishing tribe in Assam to protect from elephants and floods are also mentioned.