UnescostampsApr 18, 2023
https://unescowhstamps.blogspot.com
Venetian Works of Defense, Italy – UNESCO World Heritage Site
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UNESCO World Heritage on Stamps - Philately

Philately - UNESCO World Heritage on stamps / Philatélie - Patrimoine Mondial de l'UNESCO et timbres / Filatelie - Patrimonio Mundial UNESCO y sellos / Philatelie - UNESCO Welterbe und Briefmarken