Ninh Binh, June 23 -- Twelve years after being recognised by UNESCO as a World Cultural and Natural Heritage Site, the Trang An Landscape Complex in the northern province of Ninh Binh continues to stand out as Southeast Asia's only mixed world heritage property, celebrated for both its exceptional natural beauty and rich cultural significance. Since receiving the UNESCO status on June 23, 2014, Trang An has transformed not only Ninh Binh's tourism sector but also the local development strategy. The province welcomed 4.3 million visitors in 2014, generating tourism revenue of more than 940 billion VND (35.7 million USD at the current exchange rate). A decade later, visitor arrivals had doubled to 8.7 million while tourism earnings surged n...