जंतर-मंतर कब बनाया गया था

know facts of जंतर-मंतर का निर्माण किसने करवाया था , कब हुआ | Jantar-Mantar was build by whom and when in hindi ? question : by whom Jantar-Mantar was constructed ? answer : The famous monument was built by ‘Sawai Jai Singh’ and one of best monuments the Jantar-Mantar build…