SIEM REAP.- Irina Bokova (C), director general of UNESCO, listens as Cambodian Ly Vanna (R), director of Preah Norodom Sihanouk Angkor Museum, explains during her visit to Angkor Wat complex in Siem Reap province, some 300 kilometers northwest of Phnom Penh on June 19, 2013. Six ancient Syrian sites as well as Australia's Great Barrier Reef could be listed as endangered by UNESCO, which on June 16, began its annual session to decide which global cultural and natural treasures merit World Heritage status. Around 1,300 delegates were due to attend the ten day conference in Cambodia, which officially opened in the capital Phnom Penh late June 16. The closing ceremony is to be held in the country's own heritage site, the temple complex of Angkor in Siem Reap. AFP PHOTO.