Vietnam has a great variety of man-made wonders ranging from prehistoric monuments, historical cities and towns, fortifications, Buddhist shrines, Hindu temples to tunnels and tombs. Listed as World Heritage Sites by UNESCO, many of these wonders attract a large number of tourists each day. Among them, I am especially impressed by the complex of Hue Monuments, Hoi An ancient town, Thang Long Imperial Citadel and My Son Sanctuary. However, it is reported that many of our man-made wonders have been damaged. I suggest that the government should limit the number of tourists visiting them every day and raise money to restore and preserve them. We can hold a campaign to ask for donations from individuals and organizations. And it's a good idea to put valuable things in high-security places
