About UNESCO World Heritage Sites
A guide to how places earn, keep, and can lose World Heritage status.
What Are World Heritage Sites?
World Heritage Sites are places of outstanding universal value — a concept meaning their significance transcends national borders and belongs to all of humanity. The program was established by UNESCO's Convention Concerning the Protection of the World Cultural and Natural Heritage, adopted in 1972 and now ratified by 195 countries, making it one of the most widely adopted international agreements in history.
Sites fall into three categories: Cultural (monuments, historic cities, archaeological sites), Natural (ecosystems, geological formations, habitats of threatened species), and Mixed (sites meeting criteria in both categories).
How Are Sites Selected?
To be inscribed, a site must meet at least one of ten criteria defined in the Operational Guidelines for the Implementation of the World Heritage Convention. Criteria (i)–(vi) apply to cultural sites; (vii)–(x) apply to natural sites.
Cultural Criteria
- i A masterpiece of human creative genius
- ii Significant interchange of human values over time
- iii Unique testimony to a cultural tradition or civilization
- iv Outstanding example of a type of building or landscape
- v Outstanding example of traditional human settlement
- vi Directly associated with events of outstanding universal significance
Natural Criteria
- vii Exceptional natural beauty or aesthetic importance
- viii Outstanding examples of Earth's geological history
- ix Outstanding examples of ongoing ecological processes
- x Significant natural habitats for biodiversity conservation
In addition to meeting criteria, a site must also demonstrate integrity (wholeness and intactness) and, for cultural sites, authenticity (honesty in materials, design, and setting). States must also show they have adequate protection and management plans in place.
The Inscription Process
Adding a site to the World Heritage List is a multi-year process involving governments, independent experts, and an international committee.
Countries first submit an inventory of sites they intend to nominate. A site must appear on this list for at least one year before a formal nomination can proceed.
The nominating state prepares a detailed dossier describing the site's significance, boundaries, protection laws, and conservation management plan.
ICOMOS (for cultural sites) or IUCN (for natural sites) conducts field missions and produces a recommendation: inscribe, refer back, defer, or not inscribe.
The 21-member World Heritage Committee meets each summer to make final decisions. Inscription requires a two-thirds majority of members present and voting.
The List of World Heritage in Danger
When a site faces serious threats to the qualities that earned it inscription, the World Heritage Committee can place it on the List of World Heritage in Danger. This listing serves two purposes: it alerts the international community to conditions threatening the site's outstanding universal value, and it mobilizes emergency assistance and technical support.
Threats that can trigger an endangered listing include:
- Armed conflict or political instability
- Uncontrolled urban development or tourism pressure
- Major construction projects within or near the site
- Natural disasters such as earthquakes or floods
- Poaching or illegal logging
- Climate change and sea-level rise
- Invasive species threatening biodiversity
- Decline in the population of a protected species
Endangered status is intended to be temporary. Once the threats are resolved and the site's condition improves, the Committee removes it from the danger list. Well-known examples of sites that have been on the danger list include the Everglades National Park (USA), Abu Mena (Egypt), and Hatra (Iraq), damaged during armed conflict.
Delisting — When Sites Lose Their Status
Delisting (formally called deletion from the World Heritage List) is rare and considered a last resort. It occurs when a site has deteriorated to the point where it has permanently lost the characteristics that justified its inscription, or when the nominating state has failed to meet its obligations under the Convention. As of 2025, only three sites have ever been delisted:
The first site ever delisted. Oman reduced the protected area by 90% to allow oil exploration, destroying the conditions that supported the reintroduced Arabian oryx population.
Despite warnings, Germany constructed a four-lane bridge through the heart of the historic landscape, which the Committee determined irreparably compromised its outstanding universal value.
Large-scale waterfront redevelopment projects, including Everton FC's new stadium, were deemed to have caused irreversible damage to the city's historic docklands and skyline.
Before delisting, the Committee always places a site on the danger list first and works with the country to address the issues. Delisting is only pursued after all other options have been exhausted.