What architectural shape forms the base of the Dome of the Rock?

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The Dome of the Rock in Jerusalem, Israel, features a large gold dome and ornate blue and gold exterior, set against a backdrop of densely packed stone buildings. — Dome of the Rock Dome of the Rock, Jerusalem.

The Dome of the Rock is built upon an octagonal base. This octagonal structure is reflected in both the building's outer walls and its interior arcade, which consists of 24 piers and columns.1