Petra is a very old city that is found in a place called Jordan. It was made a very long time ago by people who lived a few thousand years ago. Petra is special because it was made in a way that makes it look like part of the mountain it was built on. That means that it is really good at hiding from people who don't know it is there!
When you visit Petra, you get to see a lot of cool things like buildings made out of stone that were carved by hand, and tombs where special people were buried. People went to Petra a long time ago because it was a very important place for trading things like spices and other things that they needed.
Today, people still visit Petra to see how amazing it is and learn about the different cultures that lived there a long time ago. But you have to be careful when you visit, because sometimes it can get really hot and there are some tricky paths to walk on. Overall, Petra is a really neat place that you should definitely try to visit when you're all grown up!