World Heritage Site in 2000. It was designated under cultural criteria for being a masterpiece of architecture and urban planning on the part of Villanueva, being an outstanding example of practical and aesthetic architecture, and for being exemplary of early 20th Century movements art and architecture, and demonstrating their ideals. UNESCO describes it specifically as "an outstanding example of the Modern Movement in architecture" and adds that "[t]he university campus integrates the large number of buildings and functions into a clearly articulated ensemble, including masterpieces of modern architecture and visual arts, such as the Aula Magna with the "Clouds" of Alexander Calder, the Olympic Stadium, and the Covered Plaza." The site did not have an associated retrospective Statement of Outstanding Universal Value in 2000 when it was inscribed, with one drafted by the Venezuelan state approved in 2013. Though acknowledging that the integrity of the site is maintained in the architectural principles of Villanueva and the overall spirit of the design, the WHS program has concerns that the reinforced concrete of the structures — something that identifies the campus with architectural advances of its time — has deteriorated in the years since construction; that being prone to social unrest could provoke damage to the site; that soil erosion poses a threat to the space; and that massive student expansion opens the campus up to more deterioration and destruction, as do works undertaken to partition and reassign spaces of the campus without consideration of the architecture the works can change design and significance of, deteriorating the combined ensemble of the entire campus and working against the spirit of Villanueva's project. However, UNESCO adds that no works have compromised the authenticity or the value of the campus. There are bodies with the purpose of creating plans to protect the site, but UNESCO reports that these are disjointed and do not work together, advising that the Cultural Heritage Institute right down to COPRED — the university's Consejo de Preservación y Desarrollo (Council of Preservation and Development) — and the separate management interface of the Jardín Botánico, as well as the regional offices of Venezuela responsible for the area at different levels of government, need to coordinate. It was also recommended that a buffer zone be initiated to the south and west of the site to protect from urban developments threatening the site. Notes References External links UNESCO World Heritage website on the Ciudad