Jantar Mantar in Jaipur Jaipur #

Jantar Mantar (Magic Device) is the name of five historical astronomical observatories that Maharaja Jai Singh II 1724-1734 built in Delhi, Ujjain, Mathura, Varanasi and Jaipur. As models were used Nasir al-Din al-Tusi observatory in Maragha and Ulugh Beg Observatory in Samarkand.