Tourists explore the Endless Stair outside at Tate Modern on September 13, 2013 in London, England. The installation is open to the public until October 10th 2013 as part of the London Design ... more 
Tourists explore the Endless Stair outside at Tate Modern on September 13, 2013 in London, England. The installation is open to the public until October 10th 2013 as part of the London Design Festival. (Photo by Mary Turner/Getty Images) less 
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Getty Images | Photo By Photo by Mary Turner/Getty Images
Fri, Sep 13, 2013 1:00 PM EDT