the Most Fascinating Man-Made Underground Structures
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What are the Most Fascinating Man-Made Underground Structures?

1,334 ViewsWhen people talk about the biggest man-made structures, they focus on above-the-ground constructions forgetting amazing underground structures do exist. Erecting such structures is a momentous task for builders and engineers as they have to battle hydrostatic pressure and the weight of the soil above. These six largest man-made underground structures in the world are […]