Dehradun is a city located in the northern Indian state of Uttarakhand. It is known for its natural beauty, rich cultural heritage and proximity to popular tourist destinations such as Mussoorie, Rishikesh and Haridwar. Some must visit places to explore in Dehradun are as follows:

1. Robber’s Cave: A popular attraction in Dehradun, the Robber’s Cave is a natural cave that features a small stream running through it. It is a great place for a picnic and a hike.
2. Forest Research Institute: This institute (also known as FRI) is a premier institution in the field of forestry research and education and one of the most popular tourist attraction in Dehradun.
3. Tapkeshwar Temple: A beautiful temple located on the banks of a small stream, the Tapkeshwar Temple is dedicated to Lord Shiva and is a popular spot for pilgrims and tourists alike.
4. Sahastradhara: This popular tourist spot is a limestone cave and a natural sulphur spring. It is located just outside of Dehradun and offers a unique and refreshing experience.
5. Malsi Deer Park: Malti Deer park is also known ad Dehradun Zoo, it is a popular spot for families and nature lovers, the Malsi Deer Park is home to a wide variety of animals and birds.
6. Chetwode Hall: A beautiful historical building located in the heart of the city, it is a great place to learn about the history and culture of Dehradun.
7. Mindrolling Monastery: A beautiful Buddhist Monastery located in Clement Town, Dehradun. It is one of the largest Buddhist monasteries in India and offers a peaceful and serene atmosphere.

These are just a few examples of the many things to see and do in Dehradun. The city also offers a wide range of delicious local food and shopping options.