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![An elderly woman and man walk past the Capela Das Almas in Porto, Portugal](http://d3e1m60ptf1oym.cloudfront.net/b466c933-f3cb-4bb8-9281-1d21535e5171/SFE_160911_001_xgaplus.jpg)
Details of the staircase at the Mercado do Bolhão, Porto, Portugal.
Details of the staircase at the Mercado do Bolhão, Porto, Portugal. One of the most emblematic buildings of the city with wrought iron architecture over two floors, the market dates back to 1839.(Photo by Stuart Freedman/In Pictures via Getty Images).
![Details of the staircase at the Mercado do Bolhão, Porto, Portugal.](http://d3e1m60ptf1oym.cloudfront.net/7ae1fc8b-0d6f-48e2-9b3e-9dceec4c767e/SFE_160910_153_xgaplus.jpg)