Jaisalmer Fort is a massive sandstone fortification located in the city of Jaisalmer, in the Indian state of Rajasthan. It is one of the largest forts in the world and is also known as the "Golden Fort" or "Sonar Qila" because of its yellow sandstone walls that glow in the sunlight.

The fort was built in 1156 by Rajput ruler Rawal Jaisal, on top of a hill overlooking the city. It served as a strategic stronghold on the trade route between India and Central Asia. The fort is surrounded by a 30-foot-high wall with 99 bastions, and has four entrances, each of which is guarded by massive gates.

Inside the fort, there are several palaces, temples, and havelis (traditional Indian mansions) that showcase the rich cultural heritage of the region. The most prominent structures inside the fort include the Raj Mahal (Royal Palace), Jain Temples, Laxminath Temple, and the four massive gateways- Ganesh Pol, Suraj Pol, Bhoot Pol, and Hawa Pol. The intricate carvings and delicate work on the sandstone walls and pillars of the fort are a testament to the skilled craftsmanship of the artisans of that time.

Today, the fort is a popular tourist destination and attracts thousands of visitors every year. It was declared a UNESCO World Heritage Site in 2013. The fort also houses several families who have been living there for generations, and efforts are being made to preserve its heritage while ensuring the safety and comfort of the residents.