1: Since 1996 , he and his team have discovered more than 80 ancient Mayan cities in the jungles of Mexico , few of which the modern world had known before . 2: But just why so many settlements were simply abandoned , long before the arrival of the Spanish conquistadors , remains a mystery to which these long lost sites may provide an answer . 3: His discoveries could help explain why so many Mayan cities were abandoned before the arrival of the Spaniards .
1: more than 80 ancient Mayan cities in the jungles of Mexico 2: so many settlements 3: so many Mayan cities