... and why they might stay that way
From choking pollution and daylong traffic jams to cheek-to-jowl crowds and ear-splitting noise levels, CNBC takes a look at the woes plaguing some of the world's top travel destinations with populations of more than 1 million people—and why some of these metropolitan nightmare scenarios might not be improving anytime soon. Here's a look at some of the not-so-hot spots you might want to avoid.http://www.cnbc.com/id/101911587
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