Historic sites around Europe are at risk from storm surges, floods and rising sea levels - so how should they react?
We head to the UNESCO site of Lübeck in Germany to see how a city surrounded by water could protect itself.
Historic sites around Europe are at risk from storm surges, floods and rising sea levels - so how should they react?
We head to the UNESCO site of Lübeck in Germany to see how a city surrounded by water could protect itself.