Preet Vihar is a residential neighborhood located in the East Delhi district of New Delhi, India. While it is primarily a residential area, there are several places of interest in and around Gagan Vihar. Here are some popular sightseeing spots:

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1. Akshardham Temple: This magnificent Hindu temple is located in the nearby area of Pandav Nagar and is known for its stunning architecture and intricate carvings.

2. Red Fort: Located in Old Delhi, the Red Fort is a UNESCO World Heritage Site and a must-visit attraction for history buffs. It was built in the 17th century and served as the residence of Mughal emperors for centuries.

3. Lotus Temple: This unique temple, located in the nearby area of Kalkaji, is shaped like a lotus flower and is dedicated to the Baháʼí faith. It is a popular spot for meditation and reflection.

4. Raj Ghat: Located in the heart of Delhi, Raj Ghat is a memorial dedicated to Mahatma Gandhi, the father of the nation. It is a peaceful place to reflect on his life and legacy.

5. Humayun's Tomb: This UNESCO World Heritage Site is a stunning example of Mughal architecture and is located in South Delhi. It was built in the 16th century and is the final resting place of the Mughal emperor Humayun.

6. Chandni Chowk: Located in Old Delhi, Chandni Chowk is a bustling market known for its narrow lanes, delicious street food, and historic buildings.

7. Jama Masjid: This iconic mosque is located in Old Delhi and is one of the largest and most famous mosques in India. It was built in the 17th century and is known for its beautiful architecture and stunning views of the city.