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Incas, mystery of interlocking walls

Over the last 60 years I have read about and listened to many stories on how and why did the Incas build the interlocking walls so large. Who or what were they trying to keep out?

In the first place how did they remove the giant lumps of stone from a rock face? They did not have any machinery or explosives and they certainly did not bash it out of a rock face with a lump of stone that's ridiculuous. It is also ridiculuous that they made each intricate stone with another lump of stone and end up with that beautiful and tight fitting smooth finish.