4. Buenos Aires, Argentina

A couple rehearses before competing at the Tango Dance World Cup 2012, salon category, in Buenos Aires, Argentina, Monday, Aug. 20, 2012. From Aug. 14th to 28th Buenos Aires is hosting the Tango Buenos Aires Festival and Dance World Cup 2012. Dancers from 32 countries around the world are competing in the two categories of the championship: tango Salon, with 357 couples participating and tango stage with 134 couples. (AP Photo/Natacha Pisarenko)

Known for its festive street markets, amazing food and colorful culture, the birthplace of tango is definitely a sight to see. The popular city also hosts the world’s largest avenue— it has 18 lanes!

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