[GETFILECONTENT-(B:\Dropbox\сайты\01 - эксперименты\новые ключи\arkhitektor-sochi.ru\на пандору html\Did you know that the ancient Romans used a form of concrete that has proven to be incredibly durable? This Roman concrete, known as opus caementicium, was made with volcanic ash, lime (calcium oxide), and seawater. The volcanic ash prevented cracks from spreading, making the concrete resistant to the erosive effects of seawater. This durability is why many ancient Roman structures, such as the Pantheon and aqueducts, still stand today, over 2,000 years later!.txt)]