Jantar Mantar

Jantar Mantar in Jaipur, now a UNESCO World Heritage Site, is the largest of the five astronomical observatories founded by Maharaja Sawai Jai Singh II, the founder of Jaipur.

It is made up of sixteen geometric instruments that are used to measure time, map celestial bodies, and observe the planets' orbits around the sun. It also houses the Interpretation Centre, which assists visitors in understanding the observatory's operating principles and chronology.