The watch list, announced every two years by the non-profit organization based in New York City, highlights this year three critical man-made threats: political conflict, unchecked urban and industrial development, and global climate change.

The WMF said some of the most prominent early modern structures in Shanghai have been recognized as landmarks and the threats to the buildings from the 1920s, 1930s, and 1940s persist due to lack of awareness and development pressures.

Shanghai, China's primary economic hub, is once again experiencing a period of remarkable growth. The work of the early Chinese architects is significant historically and architecturally but lacks long-term safeguarding, the WMF said.

As for Xumishan, a Buddhist enclave with more than 130 grottoes, the main threats are exposure to the elements, vandalism and limited resources to protect the cultural site.

The grottoes were adorned with statues, wall paintings, and inscribed stelae during a 600-year period between the fourth and tenth centuries A.D.

Although the Xumishan Grottoes have been designated a National Level Cultural Relic Protected Site in China, they face imminent danger due to natural causes, including wind and sand erosion, water damage, and earthquakes.

Previous emergency conservation measures, including reconstruction of some elements in concrete, also need to be reconsidered and possibly reversed.

China's State Bureau of Cultural Relics is eager to protect the site and hopes that placement on the 2008 Watch List will not only increase public awareness of the importance of Xumishan, but also encourage international efforts to preserve this magnificent, yet little-known site, the WMF said.