The structure was built in 1799 by the Maharaja Sawai Pratap Singh, grandson of Maharaja Sawai Jai Singh, the founder of the city of Jaipur, India. He was so inspired by the unique structure of Khetri Mahal that he built this grand and historical palace.This palace is a five-story pyramidal shaped monument that rises to about 50 feet (15 m). The top three floors of the structure have the width of a single room, while the first and second floors have patios in front of them. 

The City Palace, Jaipur was established at the same time as the city of Jaipur, by Maharaja Sawai Jai Singh II, who moved his court to Jaipur from Amber, in 1727. Jaipur is the present-day capital of the state of Rajasthan, and until 1949 the City Palace was the ceremonial and administrative seat of the Maharaja of Jaipur.The Palace was also the location of religious and cultural events, as well as a patron of arts, commerce, and industry. 

Amber 

(pronounced "am-er," with a silent "b") Fort-Palace. One of the largest 

forts in Rajasthan, this UNESCO World Heritage Site is considered a very 

well-preserved 16th-century structure. Built on four levels out of pink 

and yellow sandstone and white marble, the fort boasts a number of 

unique courtyards, one of which is known as the Sheesh Mahal (mirror 

palace). Located in the Jai Mandir section of the fort and once the private 

quarters of the Maharaja (Indian prince) and his family, we'll find 

intricately embellished walls and ceilings, featuring glass inlaid panels 

and convex mirror mosaics. 

The name jantar is derived from yantra a Sanskrit word, meaning "instrument, machine", and mantar from mantrana also a Sanskrit word "consult, calculate. when Raja Jai Singh began construction in Jaipur is unknown, but several instruments had been built by 1728, and the construction of the instruments in Jaipur continued until 1738. During 1735, when construction was at its peak, at least 23 astronomers were employed in Jaipur, and due to the changing political climate, Jaipur replaced Delhi as Raja Jai Singh's main observatory and remained Jai Singh's central observatory until his death in 1743. The observatory lost support under Ishvari singh (r.1743-1750) because of a succession war between him and his brother.  

The Jal Mahal palace is an architectural showcase of the Rajput style of architecture (common in Rajasthan) on a grand scale, on Rajput architecture. The building has a picturesque view of Man Sagar Lake, but owing to its seclusion from land is equally the focus of a viewpoint from the Man Sagar Dam on the eastern side of the lake in front of the backdrop of the surrounding Nahargarh ("tiger-abode") hills. The palace was originally constructed in 1699; the building and the lake around it were later renovated and enlarged in the 18th century by Maharaja Jai Singh || of Amber.