Visit Jantar Mantar, an observatory built by Sawai Jai Singh II in the 18th century. The Maharajah, a scientist as well as an astronomer, had the principles of Euclid translated into Sanskrit. One of the most remarkable sites in Jaipur, the Jantar Mantar has fourteen major geometric devices for measuring time, predicting eclipses and tracking stars and planets. Just next to the observatory is the City Palace. Built within the fortified area of the original city, it has one of the finest monumental entrances in India. The Palace is now principally a museum housing a collection of great treasures, including miniature paintings, carpets, royal garments and other interesting objects from Jaipur's intriguing past. The former royal family retains a part of the palace for their personal use. Later visit Hawa Mahal (the Palace of Winds) for a photo-stop. Five stories in height and built of red and pink sandstone highlighted with white quicklime, it is thought that the women of the royal harem used the many casements to observe everyday life in the street below without being seen.