Business Insider's reporter took a two-week backpacking trip through six cities in four European countries.Joey Hadden/Business Insider I spent two weeks backpacking through four European countries for the first time. I visited six different cities for short stays: Berlin, Vienna, Venice, Rome, Milan, and Zurich. I didn't have enough time in each place, so I regretted packing so many destinations into one trip. Berlin, Vienna, Venice, Rome, Milan, and Zurich.