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Jantar Mantar is an astronomical observatory that dates back to 1734 and was built under the commands of Maharaja Sawai Jai Singh II. It houses the world’s largest sundial made out of stone, in addition to nineteen other architectural astronomical instruments. This place has been declared a UNESCO World Heritage site and a visit to Jantar Mantar definitely deserves to be on your list of things to do in Jaipur. Standing in the middle of the Man Sagar Lake, Jal Mahal is a spectacular five-storied palace that features the Rajput style of architecture. It was built as a hunting lodge for the rulers of this land. When the lake is full, four of these stories remain submerged under the water and only the top one remains visible. The palace is off-limits for visitors, but you can always enjoy its picturesque view by taking a boat ride in the lake.