Photograph: Delfina Utomo

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Here's a fact you probably didn't know: quarrying is a significant part of Singapore's history, fuelling Singapore's development from the 19th century. Much of the granite mined from these quarries was used for the construction of early public housing and roads in the 1970s. While the industry came to a halt by 1991, Singapore's quarries have stood the test of time and now form part of the city's natural landscape, coexisting alongside glitzy shopping malls and towering skyscrapers. Here are some you definitely shouldn't miss.