The Grand Staircase is part of the 250-room Biltmore House, a French Renaissance-style chateau completed in 1895 and located in Asheville, NC.
Based on the Chateau de Blois in the Loire Valley in France, the Grand Staircase steps are cantilevered with no visible support other than the outside wall. Each step is a solid piece of carved limestone that continues, through the wall to the outside of the house. The weight of each step outside the wall matches the weight of the step inside by using counterbalance so no interior support for the huge spiral staircase is needed.
On the outside of the tower enclosure are hand carved railings, gargoyles and statues of Joan of Arc.
Inside there are 102 spiral steps with an ornate cast-iron railing. The four story Grand Chandelier hanging in the center of the staircase has 72 lights, weighs 1,700 pounds and is held in place by a single bolt.
For images of the inside (we weren't alowed to shoot interior pictures), please see:
http://www.edisonavenue.net/2012/08/...staircase.html