The Iron Mountain Road is really an engineering feat - several "pigtail" bridges spiral down the mountain to allow the road to be constructed in the steeper sections. An unique "double tunnel" again frames Mount Rushmore.
Tuesday, September 28, 2010
Iron Mountain Road - Pigtail bridges, double tunnels and more views, Custer State Park, SD
The Iron Mountain Road is really an engineering feat - several "pigtail" bridges spiral down the mountain to allow the road to be constructed in the steeper sections. An unique "double tunnel" again frames Mount Rushmore.
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