Nain Singh Rawat was a notable Indian explorer and surveyor in the 19th century. Born in 1830 in Uttarakhand, he is best known for his extensive explorations of the Himalayas and his contributions to mapping the region. He worked for the British East India Company and played a crucial role in gathering geographical data about Tibet and surrounding areas. Rawat's most significant achievement was his journey to Lhasa, the capital of Tibet, in 1865. He disguised himself as a Tibetan monk to gather information and successfully returned with valuable insights. His work helped improve the understanding of the geography and culture of the Himalayan region, making him a key figure in the history of exploration in India.