Qal`at al-Bahrain is an archaeological site located in Bahrain. Archaeological excavations carried out since 1954 have unearthed antiquaries from an artificial mound of 12 m height containing seven stratified layers, created by various occupants from 2300 BC up to the 18th century, including Kassites, Portuguese and Persians. It was once the capital of the Dilmun civilization and was inscribed as a UNESCO World Heritage Site in 2005.
I'm getting more and more interested in UNESCO sites... Thanks so much to JP for making my collection bigger! :)