Passionate about science and astronomy and interested in the theories of Ptolemy, Copernicus and Galileo, the Maharaja of Jaipur, Jai Sing II, had this impressive open-air conservatory built between 1728 and 1733. It houses 17 instruments, many of which resemble contemporary-style sculptures. Each of these has a function, such as the Nari Valaya Yantra, which was used to calculate the time in different parts of the world, and the Brihat Samrat Yantra, the largest sundial in the world.