UNESCO has put four new sites on its World Heritage List.

The new sites, announced Friday, include China's Zuojiang Huashan rock art cultural landscape, Iran's ancient aqueducts known as Qanat, and India's archaeological site of Nalanda Mahavihara.

The World Heritage Committee also selected Micronesia's artificial islets of Nan Madol and simultaneously placed it on the List of World Heritage in Danger.

Made of basalt and coral boulders, the 99 artificial islets of Nan Madol are home to ruins ranging from temple to tombs dating between A.D. 1200 and 1500.

Gathered in the Turkish city of Istanbul from July 10-20, the committee is reviewing 27 sites of special cultural or natural significance which have been nominated for the World Heritage List.