Want to avoid the crowds? Head to a city or country on the State Department watch list. Want to avoid crowds and stay safe? Head to a city that used to be.
History moves faster than the travel industry and the best places to visit are often yesterday's war zones. The main reason the pendulum swings so far so fast is that tourists are a tremendous boon to struggling economies and are generally welcomed with open arms in places where unrest has led to instability. That makes traveling to formerly dangerous places smart for both selfish and humanitarian reasons.