No. 2: Las Vegas, Nev. What happens in Vegas stays in Vegas ... and on your body forever. With 94 listed tattoo shops, Sin City -- host of one of the biggest tattoo conventions in the country -- comes in at just above 16 shops per 100,000 people, most of whom are between the ages of 25 and 44. The city also has one of the country's highest marriage, divorce and suicide rates, in addition to holding a place on our Worst Skin, Worst Hair, Worst B.O. and Ugliest Cities lists. Remember that next time you want to document your trip after one too many giant margaritas on The Strip.