Nowadays natural and cultural heritages are increasingly deteriorated and threatened with natural and man made factors. However, because of insufficient financial, technological and scientific resources, protection of such natural and cultural heritages at regional and national level is impossible. Thus, to protect the unique and irreplaceable heritages of the earth, cooperative and international effort is a solution. This book is therefore, discussed impacts of listing heritage sites as UNESCO world heritage sites which is mainly focused on the following issues: opportunities of UNESCO world heritage status to create awareness and to promote world heritage sites, to increase visitor numbers, to increase technical and financial assistance, to built the Capacity of the Site Management and to increase benefits of Heritage Sites and threats of UNESCO world heritage status: because of the increasing number of tourists and threats because of interventions. Hence, the analysis should help the all tourism stakeholders to identify opportunities and threats of listing heritage sites as UNESCO World Heritage Sites.