Jantar Mantar
Location: Parliament Street,
Connaught Place
Metro Station: Patel Chowk
Open: All days
Timings: Sunrise to Sunset
Entry Fee: 
25 (Indians), 300
(foreigners)
Photography Charges: Nil (`25
for video filming)
Jantar Mantar (Yantra - instruments, mantra - formulae) was constructed in 1724. Maharaja Jai Singh of Jaipur who built this observatory went on to build other observatories in Ujjain , Varanasi and Mathura. Jai Singh had found the existing astronomical instruments too small to take correct measurements and so he built these larger and more accurate instruments.
accurate observations can no longer be made from here because of the tall buildings around.