Originally a serai (inn) builtby Shah Jahan on the Grand Trunk Road, the magnificent Phillaur fort was substantially reconstructed by Maharaja Ranjit Singh to serve as the easternmost outpost of his empire. Designed by the Maharaja's Italian and French generals, the fort's architecture has a distinct European character. It has an extensive moat and its outer walls are inclined inwards to deflect cannon balls. Later, it became an artillery centre for the British Indian Army. Since 1981, it has been a training school for police – the oldest in India – and is today called the Maharaja Ranjit Singh Punjab Police Academy.