Hawa Mahal  

Built in 1799, the Hawa Mahal, or Palace of the Winds, is one of the major landmarks of Jaipur. This five storey building, which looks out over the main street of the old city, is a stunning example of Rajput artistry, with its pink semioctagonal and delicately honeycombed sandstone windows. It was originally built to enable ladies of the royal household, to watch the everyday life and processions of the city. The palace was built by Maharaja Sawai Pratap Singh, and is part of the City Palace complex. There is, also, a small archaeological museum on the same site.  

When to visit 

The best season to visit Jaipur is during winters, from October to February. 

For detailed information, see Jaipur

Some of the forts and palaces you could visit while touring India are
Agra Fort, Agra
Gwalior Fort, Gwalior 
Fatehpur Sikri, Agra  
City Palace, Jaipur 
Jaigarh Fort, Jaipur
Hawa Mahal, Jaipur
Amber Fort, Jaipur
Nahargarh Fort, Jaipur 
Mysore Palace, Mysore
Red Fort, Delhi
Golconda Fort, Hyderabad