1. Guru Ram Rai came to Dehradun in 1676 when he camped here, due to which after some time it was named Dehradun in which Dehra means Dera and Doon means Valley.
2. According to the mythological story, in the Dwapar era, Guru Dronacharya had done penance in the valley around Dehradun at one time, due to which Dehradun was earlier known as the city of Drona.
3. Talking about Rishikesh, Lord Vishnu killed the demons here on the request of the sages suffering from demons and provided this place to the sages. Which later came to be known from Rishikesh. Evidence of this will also be found in the Skandha Purana.
4. Dehradun was known as Sudha Nagar until the 7th century when it was described by the famous Chinese traveler Hensang. Later it also came to be known as Kalsi as it was ruled by Emperor Ashoka.
5. The British arrived in Dehradun in 1816, due to which in 1900 the British connected Dehradun to Haridwar by rail line.
6. Basmati rice of Dehradun is world famous.
7. In the 1990s, 50 thousand Maduros were simultaneously suffering from lung disease in the Long Dhar cave located in Dehradun due to limestone, after which they vomited blood and died there.
8. The clock in the clock tower is the only one in Asia.
9. IMA, one of the most prestigious academies in India, which is located in Dehradun, was built on October 1, 1932.
10. Captain Vikram Batra, who was awarded the Param Vir Chakra, completed his training from IMA, Dehradun.
11. Sahastradhara Vasant in Dehradun is known to have sulfuric healing properties for any kind of skin diseases
12. Dehradun is considered the litchi capital of India.
13. When the 23-year-old Tibetan spiritual leader, the Dalai Lama, was exiled in 1959 due to the occupation and colonization of Tibet by China, he came to Mussoorie to establish a Tibetan government-in-exile. Mussoorie has the honor of becoming the first home of His Holiness the Dalai Lama in India.
14. The name Mussoorie located in Dehradun is derived from the word Mansoor which is a shrub which was once found in abundance in this region.
15. The second highest point of Mussoorie in Dehradun, Gun Hill was extremely important before independence, as a cannon was kept here which was fired every day at noon for people to adjust their clocks.
16. Our country’s first indoor ice rink is in Dehradun.
18. There was a shortage of milk during the birth of Ashwathama, so Guru Dronacharya, on the strength of his penance, worshiped Lord Bholenath in this cave, after that milk started dripping on the Shivling on its own. Milk continued to drip on the Shivling for years, since then the name of this temple was Tapkeshwar Mahadev.
19. After defeating Ravana, Lakshmana, the younger brother of Maryada Purushottam Shri Rama, did penance in the Lakshman Siddha temple.
20. Maharishi Gautam, one of the great sages and the founder of mantras, resided in the Gautam Kund, Dehradun in Chandrabadni.
21. Battle of Nalapani, the first Anglo-Nepalese war took place around Nalapani Fort which is in Dehradun.
22.Dehradun was also known as “Grey City” in its early days as most of the ex-armymen and VIPs consider this place as their post retirement residence.
The Forest Research Institute (FRI) campus with an area of 23.450 hectares is the largest campus in India.
24. The first batch of Indian Military Academy (IMA) cadets are known as pioneers.
25. Historic Paltanbazar in Dehradun has been awarded the International Award for Best System and Facility.
26.Dehradun produces the sweetest litchi in the country.
27. Apart from Bombay and Delhi, Dehradun was the only place where cabaret shows were held in the 60s.
28. Doon has been consistently ranked as the best residential school in India by media such as BBC, Times of India and Outlook.
29. The Indian Military Academy was inaugurated by Field Marshal Chetvod at the end of the first term.
30. The only school in India that lets you wear olive green uniform is RIMC which is in Dehradun.
31. Dehradun city has the oldest Braille Press, which was established in 1951 by the Government of India, Ministry of Welfare.
32. Dehradun was invaded by Mahmud of Ghazni during his campaign in India, followed by Timurlang in the year 1368. After that, Ruhela Nijbuddul in 1757 and Ghulam Qadir also attacked in 1785.
34. The first and oldest Forest Institute was established in 1878 by Dietrich Brandeis in Dehradun.
35. The rule of Ashok Maurya over the city of Dehradun lasted from 273 BC to 232 BC.\
36. In 1860 a historian named John Forest found a rock edict at Kalsi, which tells the story of Mauryan era in Dehradun.
37. Rishikesh is known as the “Gateway to the Char Dham”, which is in Dehradun.
38. Mussoorie was discovered in 1820 jointly by Captain Young, serving in the British Army, and Mr. Shore, the Superintendent and resident of Doon.
39. Rishikesh is also known as the “Yoga Capital of the World”.
40. Rishikesh is also known as Tapobhoomi, i.e. the place of meditation and yoga for the deities.41. Chakrata was earlier known as Jaunsar Bawar, which was a small village of Jaunsari tribe.
42. George Everest of Mussoorie also known as Park Estate was built in 1832 and was first.