The structure was built in 1799 by 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 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 front elevation, as seen from the street, is like a honeycomb with small portholes. Each porthole has miniature windows and carved sandstone grills, finials and domes. It gives the appearance of a mass of semi-octagonal bays, giving the monument its unique façade. The inner face on the back side of the building consists of chambers built with pillars and corridors with minimal ornamentation, and reach up to the top floor. The interior of the palace has been described as “having rooms of different coloured marbles, relieved by inlaid panels or gilding; while fountains adorn the centre of the courtyard”.
Built-in red and pink coloured sandstone, in keeping with the décor of the other monuments in the city, its colour is a full testimony to the epithet of “Pink City” given to Jaipur. Its façade with 953 niches with intricately carved jharokhas (some are made of wood) is a stark contrast to the plain-looking rear side of the structure. Its cultural and architectural heritage is a reflection of a fusion of Hindu Rajput architecture and Islamic Mughal architecture; the Rajput style is seen in the form of domed canopies, fluted pillars, lotus, and floral patterns, and the Islamic style as evident in its stone inlay filigree work and arches (as distinguished from its similarity with the Panch Mahal at Fatehpur Sikri).
The entry to the Hawa Mahal from the city palace side is through an imperial door. It opens into a large courtyard, which has double-storeyed buildings on three sides, with the Hawa Mahal enclosing it on the east side. An archaeological museum is also housed in this courtyard.
Hawa Mahal was also known as the chef-d’œuvre of Maharaja Jai Singh as it was his favourite resort because of the elegance and built-in interior of the Mahal. The cooling effect in the chambers, provided by the breeze passing through the small windows of the façade, was enhanced by the fountains provided at the centre of each of the chambers.
The top two floors of the Hawa Mahal are accessed only through ramps. The Mahal is maintained by the archaeological department of the Government of Rajasthan.
According to Wikipedia