Jantar Mantar City Identification

To answer the question about which cities Maharaja Jai Singh II did NOT build a Jantar Mantar, we need to identify the actual locations where these astronomical observatories were constructed.

Maharaja Jai Singh II's Jantar Mantar Locations

Maharaja Jai Singh II commissioned the construction of five Jantar Mantars in India. These observatories are located in:

• Jaipur
• Delhi
• Ujjain
• Varanasi
• Mathura (though this one is no longer extant)

Analyzing the Options

Comparing the given options with the known locations:

• Allahabad: This city is not among the five locations where Maharaja Jai Singh II built a Jantar Mantar.
• Varanasi: A Jantar Mantar exists here, built by Jai Singh II.
• Delhi: A Jantar Mantar exists here, built by Jai Singh II.
• Jaipur: The largest and most famous Jantar Mantar is located here, built by Jai Singh II.

Therefore, Maharaja Jai Singh II did not build a Jantar Mantar in Allahabad.