Canals of Amsterdam
Concentric 17th-century canal ring (Singel, Herengracht, Keizersgracht, Prinsengracht), UNESCO since 2010. 165 canals totaling 100 km, 1,281 bridges. Boat tours, canal-side cycling, leaning canal houses.
Amsterdam's narrow tall houses are deliberately leaning toward the street to ease hoisting goods to the attic with a pulley (« hijsbalk »). 17th-century property tax was based on facade width — hence the hyper-narrow but very deep houses.
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