Capstone

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It has been suggested that this article or section be merged into Keystone (architecture). (Discuss)
For other uses, see Capstone (disambiguation).

The capstone is the highest also referred to as apex, rock or mount of a structure. Often they have "doorways", the capstone would lock or wedge the rest of the rocks tightly together, giving strength, much like a wedge when driven into a tight spot. In an arch, the capstone, or sometimes called the keystone or coping stone, holds the arch together. It is a key formation in the structure of megalithic tombs.

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