Washington DC named Best Cosmopolitan City in the World 1) Washington, DC, USA 2) El Chaltén, Argentina 3) Milan, Italy 4) Zermatt, Switzerland 5) Valletta, Malta 6) Plovdiv, Bulgaria 7) Salisbury, UK 8) Vienna, Austria 9) Chennai, India 10) Toronto, Canada. USA has been the favorable destination for many people across the Globe and it is not a surprise of ...