Tabo Monastery is located in the state of Himachal Pradesh.

Key Points:
1. Introduction to Tabo Monastery:
- Tabo Monastery, also known as Tabo Chos-Khor Monastery, is a Buddhist site situated in the Spiti Valley of Himachal Pradesh, India.
- It is one of the oldest and most important Buddhist monasteries in the Trans-Himalayan region.

2. Historical Significance:
- Tabo Monastery was founded in 996 CE by the Tibetan Buddhist scholar Rinchen Zangpo during the time of the Tibetan King Yeshe O.
- It holds great historical and religious significance as it played a vital role in the spread of Buddhism to the region and acted as a center for learning and meditation.

3. Architectural Marvel:
- The monastery is renowned for its ancient murals, sculptures, and paintings that depict various Buddhist deities, mandalas, and scenes from the life of Buddha.
- The complex consists of several temples, assembly halls, and residential quarters for the monks.
- The main temple, known as the Tsuglagkhang Temple, is a three-story structure with exquisite artwork and houses a large statue of Buddha.

4. UNESCO World Heritage Site:
- Tabo Monastery was declared a UNESCO World Heritage Site in 1996 under the name "Tabo Monastery and Archaeological Site."
- It was recognized for its exceptional architectural and artistic significance, as well as its contribution to the preservation and promotion of Buddhist culture.

5. Cultural Significance:
- The monastery continues to be an active religious and cultural center, attracting both local and international visitors.
- It hosts various religious ceremonies, festivals, and teachings, contributing to the preservation and propagation of Buddhist practices.

In conclusion, Tabo Monastery is located in the state of Himachal Pradesh. It is an ancient Buddhist site with a rich history, remarkable architecture, and cultural importance. Its recognition as a UNESCO World Heritage Site further enhances its significance.