Umm al-Rasas(also spelled Umm ar-Rasas and Um er-Rasas) is an important archaeological site that was declared a World Heritage Site in 2004. Its structures date from the 3rd to 9th centuries and most have not yet been excavated. The site is especially known for its magnificent Byzantine mosaics, which have been uncovered in two churches dating from the 6th and 8th centuries,, and you can see it by making a Dead Sea Day Tour or a visit to Madaba City Actually the term “Rassas” refers to the Arabic root “Rass” indicating the action of putting something on top of something else in perfect alignment. Therefore Um er-Rasas or “Mourassas” in the toponomastic of the region is a term indicating a well-built structure The builders at Umm al-Rasas used a technique which involved fitting the rocks together closely, resulting in strong structures that have resisted several earthquakes. Arches still standing, as well as the Stylite tower itself, testify to the superior quality of construction.UmmrRasas