Eksar memorial from Borivali: One of the five hero stones to be excavated from the suburb, which now boasts of high-rises. Virgals started occurring from the 4th-5th century and continued till the medieval times. This stone shows a naval battle with armies fighting in boats. The naval battle appears to be a historical event and stylistically belongs to the late Silahara period. Pics by Dr Sreekant Jadhav, Trustees, CSMVS, Mumbai

If your idea of Mumbai’s history harks back to British rule, you need to rewind some more. That the city has a prehistoric past is evident by an anecdote about Col KRU Todd of the Royal Indian Navy, who, in the 1930s, discovered Old Stone Age implements in the city’s northern suburbs, particularly at Kandivali, from where mud was brought for reclamation of the Back Bay area.