5. Aqueduct Ringvaart Haarlemmermeer, Netherlands

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Source: mrmartinusjr.blogspot.com

The Netherlands's oldest water bridge, the Ringvaart, is a circular canal surrounding the Haarlemmermeer polder - a low-lying tract of land enclosed by dikes. The spectacular structure forms the boundary of the Haarlemmermeer municipality, and makes for a splendid sight to look at.