Jantar Mantar is a/an
Answer: A
Jantar Mantar is an observatory.
Sawai Jai Singh II built five between 1724 and 1735, at Delhi, Jaipur, Ujjain, Mathura and Varanasi. Their masonry instruments - the Samrat Yantra sundial, the Jai Prakash Yantra - measure time and the positions of the stars. The Jaipur one is a UNESCO World Heritage site.
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