In the mid-nineteenth century, an aqueduct was constructed in Braine-l'Alleud in Walloon Brabant to bring water from the Hain River to the Belgian capital, Brussels.
A 941-meter-long aqueduct stretches across the Alcântara Valley in the Portuguese capital, Lisbon.
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A collapsed and flooded complex of mining galleries stretches between 600 and 800 metres below the cyclocross World Cup 2025 course in the northern French town of Liévin.
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