ahlam1399
07-05-2017, 06:03 PM
http://img-s-msn-com.akamaized.net/tenant/amp/entityid/BBDM15W.img?h=100&w=100&m=6&q=60&o=f&l=f&x=539&y=249Some 2,000 years after they were first erected, Ancient Roman harbours made from concrete are still standing across Europe.
أكثر... (http://www.msn.com/en-ca/news/world/mystery-of-2000-year-old-roman-concrete-solved-by-scientists/ar-BBDMogy?srcref=rss)
أكثر... (http://www.msn.com/en-ca/news/world/mystery-of-2000-year-old-roman-concrete-solved-by-scientists/ar-BBDMogy?srcref=rss)