World's most photographed spiral staircase at the Vatican Museums. Designed by Giuseppe Momo in The stairs are actually two separate helixes, one leading up and the other leading down, that twist together in a double helix formation.
Did You Know? The Grand Bazaar in Istanbul is one of the largest and oldest covered markets in the world, with 61 covered streets and over shops which attract between and visitors daily. A very interesting and amazing place to shop.