The article deals with the design and construction of a hypothetical gate tower, which was built in the frame of the Archaeological open air museum at Liptovská Mara, Slovakia. It describes two different approaches towards its mock-up construction, which were realized before and now and with gained experience – from two different points of views: scientific (technology) and operational. Construction of the gate resulted from a co-operation among the Archaeological Institute of the Slovak Academy of Science (AÚ SAV), Slovak University of Technology in Bratislava (STU BA), Institute of Architectural Heritage Conservation of the Slovak republic (PÚ SR) and the Museum of Liptov in a frame of the project “Ochrana a záchrana historických pamiatok na Slovensku ako integrálna súˇcast’ európskeho kultúrneho dediˇcstva (koncepcia a realizácia)” / “Protection and Preservation of Cultural Heritage in Slovakia as an Integral Part of European Cultural Heritage (Concept and Realising)”., Oto Makýš., and Obsahuje seznam literatury