Former_UNESCO_World_Heritage_Sites
World Heritage Sites may lose their designation when the UNESCO World Heritage Committee determines that they are not properly managed or protected. The committee can place a site it is concerned about on its list of World Heritage in Danger of losing its designation, and attempts to negotiate with the local authorities to remedy the situation. If remediation fails, the committee then revokes its designation.
A country may also request to reduce the boundaries of one of its existing sites, in effect partially or fully delisting such properties. Under the World Heritage guidelines, a country must report to the committee whenever one of its properties "inscribed on the World Heritage List has seriously deteriorated, or when the necessary corrective measures have not been taken."[1]
Three sites have been completely delisted from the World Heritage List: the Arabian Oryx Sanctuary in Oman, the Dresden Elbe Valley in Germany and Liverpool Maritime Mercantile City in the United Kingdom.[2][3]