International campaigns for sites were launched in the 1960s，and these sites often became World Heritage sites，and the World Heritage concept itself developed from these first international campaigns launched by UNESCO. However，international campaigns are much broader in their scope，more complex in their technology，and involve millions of US dollars.The Abu Simbel project in Egypt，for example，cost in excess of $80 million. Over the years,26 international safeguarding campaigns were organized，costing altogether close to $1 billion.