In Jaipur, the important tourist attraction is - Jantar Mantar, was originally built by Sawai Jay Singh II - the Maharaja of Jaipur. A little distance of Connaught Circus at Sansad Marg it was built in the mid 18th century. It is space observatory a house that is instrumental in observing astronomical and aeronotical movements of sun, moon and other stars and planets. The Jantar Mantar at Jaipur is the biggest and most elaborate observatory in India .

Jai Prakash Yantra : It is used to find out the positions of the celestial bodies during days and nights. It is a two hemispherical bowl structure, which represents the celestial sphere and there is a vertical rod in the center.

Samrat Yantra : It consists of a massive triangle with a curved structure on both sides.

Ram Yantra : It is an instrument used to indicate the altitude and the azimuth or declination of celestial bodies.

And do u know....that, There is one Bhairab Temple as old as Jantar-Mantar.
How to reach
Jaipur can be easily accessed through air, train or road.

By Air : Jaipur has its own airport, and is well connected to all other tourist and business centres.

By Rail : Jaipur is well connected to Delhi by Shatabdi Express and the Pink City Express. Other connections to Jaipur are from Bikaner , Jodhpur , Udaipur , Ahemadabad, Secunderabad and Lucknow .

By Road : A network of reasonably comfortable tourist buses, run by road corporations of Rajasthan, Haryana and others.

Climate : Jaipur has got extreme climate. Summers are invariably hot and winters are not very cold. Best time to visit from October to March, when the weather remains cool and tolerable.