Bhitagarh is a place where people used to live a very long time ago. Think of it like a big building where many families lived together. It was made of sandstone - kind of like really hard sand - and had tall walls all around it to keep people safe.
Inside Bhitagarh, there were many houses and even a big temple. People would worship their gods there and pray for good luck and happiness. They also had markets where people could buy and sell things like food and clothes.
But one day, the big walls around Bhitagarh weren't enough to protect the people from invaders who wanted to take over the city. The invaders attacked with very strong weapons and were too powerful for the people of Bhitagarh to fight back. Sadly, many people lost their lives in the battle.
Nowadays, Bhitagarh is a place where people can go and see the ruins of this once-thriving city. It's kind of like a big puzzle that people are trying to solve - they're trying to understand how the city used to look and what life there was like long ago.