Jal Mahal, a pleasure palace situated in the middle of a tank known by the name of Khan Sarovar. According to a Persian inscription over the main entrance, itwas erected by Nawab Shah Quli Khan who was the Governor of Narnaul for 52 years. The Jal Mahal was constructed during the reign of Akbar in A.D. 1590-91. The tank was completed in A.D. 1592-93. The Jal Mahal was one of the many structures in the elaborate complex of water harvesting structures erected in the dry arid zone in which the builders made use of the natural gradients for the drainage, collection and harvesting of monsoon rains.The entrance to the palace is from the north through a gate house, with rooms for guards, constructed over a bridge resting on sixteen arched spans. The palace consists of a square central chamber with four small chambers on the sides placed at its four corners. The corner chambers are double-storeyed within the same height. Four stair-cases, two each in the north and south faces, give access to the upper storeys. The roof of the central chamber is crowned by an octagonal cupola surrounded by a hemispherical dome balanced by four smaller cupolas placed over the corner chambers.
In view of its historical importance, it was declared protected as a monument of national importance vide notification no. S.O. 1906 dated 04.08.1961.