The island of Saint Louis in Senegal was listed in 2000 as a UNESCO World Heritage site, but it has since fallen into disrepair.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/rising-sea-levels-threaten-unesco-site-senegal
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/al-jazeera
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-impacts
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/senegal
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sea-level-rise
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/unesco
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa