By far the most formidable city in America is Detroit, Michigan. The old auto-manufacturing town owns the records on our list for both the greatest number of murders (45.15 per 100k) and aggravated assaults (1,256.77 per 100k). With 2,072.33 violent offenses per 100,000 residents, Detroit is a serious place to reside or tour. Though it can be difficult to see the shiny side in a city that has just risen from bankruptcy, there is hope – murders in Detroit decreased 14% from 2012 to 2013 and a further 5% the following year. Be attentive if you tour, though – 70% of offenses are said to be unsolved.