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A holiday at 4mph: Canals, quiet and calm on a narrowboat break in Wales

Narrowboat along the Llangollen Canal in Wales. "crossed the Pontcysyllte Aqueduct, engineering" Read more:

The highest, tallest, longest and oldest bridges in the world

The tallest bridge in the world - Millau Bridge, France

Unique bridge between Sweden and Denmark goes underwater and becomes a tunnel to allow ship passage.