Reinforced concrete is heavy and its steel skeleton vulnerable to rust. Now researchers have replaced the steel with carbon fibre mesh. The result is lighter and more flexible than standard concrete slabs.
Some five kilometers from mainland Germany, 10 patches of marshland known as the Hallig islands are at risk from rising sea levels. Regular flooding could help them survive.
A complex of crumbling former Nazi bunkers in a northeast Poland forest became a Disneyland for selfie-stick wielding tourists. Also the site of an assassination attempt on Hitler, it's now getting a facelift.
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