Jantar Mantar is an astronomical observatory its constructed in 1724 by Maharaja Jai Singh of Jaipur. Fascinating for their ingenuity, the instruments at Jantar Mantar can no longer be used accurately because of the tall buildings around.
However, a visit to admire the science of Indian astronomy makes it one of the most visited tourist attractions in Delhi. The principal instruments of the observatory are the Samrat Yantra, Jai Prakash, the Ram Yantra, and the Misra Yantra. There is also a temple of Bhairava, located near the building. It was also built by Maharaja Jai Singh II.
Entry fee: INR 5
Opening hours: Sunrise to sunset
Must visit: Central Park in Connaught Place and get a selfie with the largest Tiranga
Tip: This place often witnesses several cultural events.