Jantar Mantar is a collection of 19 astronomical instruments built by Rajput king Sawai Jai Singh, the founder of Jaipur, Rajasthan and this monument was completed in 1734. The monument features instruments operating in each of the main classical celestial coordinate systems: The horizon zenith local system, The Ecliptic system. The monument was damaged in the 19th century. Jantar Mantar is not astronomical but also includes science, architecture and art. It has all this in it. It is not just homeware but it also has a mixture of complete science and art. There is one very wonderful thing in it and that is the watch. This is not a normal watch, it works without battery or any machine, it works only with the help of sunlight and tells the correct time. This is the most precious thing in Jantar Mantar and along with that, guides are also available for those who go there early in the morning, they will guide you well and explain about it and also the very old history of Jantar Mantar, they will tell you that too, you can take help from them too. Also, people go to Jantar Mantar for photoshoots and those places are very peaceful. A lot of tourists also come to Jantar Mantar and all those things attract them a lot, for them this history and all the things to watch are new and unique. That is why Jantar Mantar is made for both tourists and locals, everyone comes here and enjoys it a lot. Jantar Mantar entry fees are low and it is less for students, if you go with your student ID then it costs less. You should go to Jantar Mantar during the day, the view is very nice during the day. So if you ever visit Jaipur, you must visit Jantar Mantar.