Chris and Ed go head to head to explain the Jaipur Observatory, but find their song has been gatecrashed by the Rajput king Jai Singh and a mysterious pop-star.

The walled city of Jaipur, in the state of Rajasthan in north-west India, was founded in 1727 by Sawai Jai Singh II. Almost 300 years later, it remains breathtakingly beautiful... 1,223 sites are ...