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Jantar Mantar at Jaipur is the largest stone observatory in the World and this feature makes it, a special destination for a traveler. Jantar Mantar of Jaipur is one of the five astronomical observatories built by Maharaja Jai Singh, the founder of Jaipur. During the period between 1727 and 1733, Jantar Mantar took its form and structure. Initially Jantar Mantar was named as Yantra Mantra, which means instruments and formulae, but due to mispronunciation of the term, it is changed to the recognized name.

Jantar Mantar was conceptualised with the primary aim of unraveling the mystery of outer space. In the days of yore, Jantar Mantar served the purpose of carrying out astronomical observations and also inspired and motivated many to become interested in the science of astronomy, at a time when the society at large had become entangled in silly superstition and religious bigotry.

Some of the astronomical apparatuses on display at Jantar Mantar are the Samrat Yantra, Ram Yantra, Jaiprakash Yantra along with a gigantic hemisphere on the northern parapet.

Under the instigation of Emperor Muhammed Shah, Sawai Jai Singh II was given the extra ordinary task of correcting the anomalies of the astronomical chart. Not only did he accomplish the task successfully but his brilliant astronomical mind provided him with his place in the sun alongside some of the world's greatest observatory designers like Ulug Beg and John Flamsteed.

The Jantar mantar in Jaipur is the most famous one among the five observatories built by Sawai Jai Singh and is located close to the gate of the famous City Palace of Jaipur. So when you are in Jaipur, do not miss the opportunity to check out the biggest stone observatory in the world, which is still in a running condition and stands witness to the wisdom of the former age.