答案:There are a variety of problems confronting tourist cities around the world. One problem facing the UNESCO world heritage sites is the pressure of mass tourism. The original idea behind having the world heritage status is conservation, preservation and restoration, but in many places it seems to be primarily geared toward promoting tourism and gaining economic benefits. Places that didn't see a lot of tourists are now struggling to accommodate the surge in tourists after getting the world heritage status. The boom of tourism has brought great economic benetits Jem for the local government and local people, but such economic imperatives are most likely to do harm to the heritage sites.