Jantar Mantar, located in Delhi, is an ancient observatory built by Maharaja Jai Singh II of Jaipur in the early 18th century. It is a remarkable architectural marvel consisting of 13 instruments designed for astronomical observations and calculations. Jantar Mantar's precise construction allows for accurate measurements of time, celestial movements, and other astronomical phenomena. It served as a center for astronomical research and education during its time. Today, it stands as a UNESCO World Heritage Site and attracts tourists and history enthusiasts who marvel at its scientific ingenuity and historical significance. Jantar Mantar is a testament to India's rich scientific heritage.