Within close proximity to the City Palace is the observatory called Jantar Mantar meaning ‘instrument of calculation’. This is probably the most famous tourist attractions in Jaipur and dates back to 1728 and was added to the World Heritage List in 2010. Apart from housing a number of bizarre sculptures, the structure of the Jantar Mantar is known to serve a specific purpose; hence, it is advised to take a tour guide whilst visiting this remarkable structure in Jaipur.