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Herengracht 54 - Amsterdam Monumentenstad, database van de Amsterdamse grachtengordel
File:Metro Amsterdam, Car 1A line 54 to Central Station p2.JPG - Wikimedia Commons
I amsterdam - In Westerstraat in Amsterdam, the house numbers skip from 54 to 70. But if you look closely, between the two houses, you'll see the houses of the numbers missing