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Photo: G.Lanting, CC BY-SA 3.0 via Wikimedia Commons
De Boekenberg (the mountain of books) is the Spijkenisse public library, which is shaped like a pyramid or mountain, with books upon books stacked up to the ceiling.
© OpenStreetMap contributors
Museum run entirely by volunteers. The museum shows the history of Spijkenisse through the façade of a simple grocery store.