2015 Trending Cities See The World This Year Here are three international cities that you'll want to put on your 2015 itinerary. Chennai, India Travel the new metro rail & discover temples, museums, beaches and Kollywood. Milan, Italy Explore the future of food at Expo 2015, a world's fair held through October. Vienna, Austria Marvel at the architecture along Ringstrasse, a 150 year-old boulevard of beauty.   2015 Trending Cities See The World This Year Here are three international cities that you'll want to put on your 2015 itinerary. Chennai, India Travel the new metro rail & discover temples, museums, beaches and Kollywood. Milan, Italy Explore the future of food at Expo 2015, a world's fair held through October. Vienna, Austria Marvel at the architecture along Ringstrasse, a 150 year-old boulevard of beauty.   2015 Trending Cities See The World This Year Here are three international cities that you'll want to put on your 2015 itinerary. Chennai, India Travel the new metro rail & discover temples, museums, beaches and Kollywood. Milan, Italy Explore the future of food at Expo 2015, a world's fair held through October. Vienna, Austria Marvel at the architecture along Ringstrasse, a 150 year-old boulevard of beauty.   2015 Trending Cities See The World This Year Here are three international cities that you'll want to put on your 2015 itinerary. Chennai, India Travel the new metro rail & discover temples, museums, beaches and Kollywood. Milan, Italy Explore the future of food at Expo 2015, a world's fair held through October. Vienna, Austria Marvel at the architecture along Ringstrasse, a 150 year-old boulevard of beauty.