Jantar Mantar
Jantar Mantar is an 18th-century astronomical observatory built by Maharaja Sawai Jai Singh II between 1724 and 1734. Located in the heart of Jaipur near City Palace, it features 19 large-scale architectural astronomical instruments including the world's largest stone sundial. Designated as a UNESCO World Heritage Site, this historic monument represents a remarkable fusion of science, architecture, and astronomy from the early modern period.