In Ladakh, the Hemis Festival is observed at which type of religious institution?

The correct answer is Buddhist monastery.

Explanation:
The Hemis Festival (also known as Hemis Tsechu) is one of the largest, most famous, and most colorful religious festivals in the Union Territory of Ladakh, India. It is celebrated at the famous Hemis Monastery (Hemis Gompa), which is a Tibetan Buddhist monastery of the Drukpa Lineage located in Hemis, Ladakh.

Key Highlights of the Festival:
• Significance: The festival marks the birth anniversary of Guru Padmasambhava (Lord Guru Rinpoche), who is revered as the spiritual founder of Tibetan Tantric Buddhism.
• Sacred Mask Dance (Cham): The central attraction of the festival is the sacred masked dances performed by the monastery's lamas (monks) in the central courtyard. These dances depict victory of good over evil.
• Cultural Heritage: Monks play traditional music using cymbals, drums, and long horns, attracting thousands of Buddhist pilgrims and tourists from around the world.