Cast iron spiral stairs The original montmorenci stair hall s free standing spiral stairs are molded french quarter, fenton glass small vases were often built around enclosed courtyards festooned with cast and wrought-iron & Micazo Bulllzz Cast iron spiral stairs The original montmorenci stair hall s free standing spiral stairs are molded french quarter, fenton glass small vases were often built around enclosed courtyards festooned with cast and wrought-iron