Yearning For A Second Passport? Don't Bother Trying In These Countries

In some countries, it's easy to live there for a few years and become a citizen.
But according to Business Insider, it's nearly impossible in others.
Vatican City is the smallest country on Earth, and has one of the toughest immigration policies on the planet.
You could try the Vatican--but only if you happen to be a cardinal living in Vatican City or Rome.