Question: is jantar mantar a world heritage site?
Answer: Jantar Mantar, Jaipur. ... The Jantar Mantar is a collection of nineteen architectural astronomical instruments built by the Rajput king Sawai Jai Singh I, the founder of Jaipur, Rajasthan. The monument was completed in 1734. It features the world's largest stone sundial, and is a UNESCO World Heritage site.