<p><strong>Buddhist monks collect their belongings at a flooded temple in the ancient city of Ayutthaya, <a href="http://travel.nationalgeographic.com/travel/countries/thailand-guide/">Thailand</a>, on October 7. </strong></p><p>The 14th-century Siamese capital, listed as a <a href="http://whc.unesco.org/">UN World Heritage</a> site, has been flooded for more than a week, according to the UN, which is sending a mission to Ayutthaya to survey the damage.</p><p>"This is the worst flood in our historical site in 16 years," Somsuda Leeyawanich of the Thai Fine Arts Department told CNN.</p><p>"We are very concerned that if the site is under water for more than 30 days, it may cause serious damage," she said. "The temples are over 400 years old."</p><p>Since July, at least 224 people have died in Thailand's worst <a href="http://environment.nationalgeographic.com/environment/natural-disasters/floods-profile/">flooding</a> in 50 years, according to Reuters.</p><p>(See <a href="http://news.nationalgeographic.com/news/2011/05/110524-biggest-floods-mississippi-river-usgs-list-freshwater-environment/">"Biggest Floods in History-Does Mississippi Make the List?"</a>)</p>