Spiral staircase in Golestan Kaus dome

Spiral staircase in Golestan Kaus dome

Gonbad-e Qabus

Spiral staircase in Golestan Kaus dome

Homan Golestan Steel and Wood Industries Company

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Various types of round staircases

Spiral staircase in Golestan Kaus dome

Domed spiral staircase

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Various types of round staircases