Explanation
No. Inscription on UNESCO's World Heritage List does not make UNESCO the owner of a site. International recognition and conservation cooperation do not amount to a transfer of property.
Article 6 of the World Heritage Convention expressly respects national sovereignty and property rights established by national legislation. The U.S. National Park Service independently explains that direct authority over listed U.S. properties remains with the governments or organizations that own and manage them.
This does not mean the designation carries no responsibilities. Article 4 places the principal conservation duty on the country concerned, while Article 7 establishes international cooperation and assistance. Those commitments are distinct from ownership.
Key takeaway
World Heritage status creates a framework for recognition and conservation cooperation; it does not give UNESCO ownership of the site.