Between 1727 and 1734 Maharajah Jai Singh II of Jaipur, India, constructed five astronomical observatories in his native territory of west central India. The observatories called “Jantar Mantars” incorporate multiple buildings of unique form, each with a specialized function for astronomical measurement. These structures with their striking combinations of geometric forms at large scale, have captivated the attention of architects, artists, and art historians world wide, yet remain largely unknown to the general public.