If you have an American passport, you pretty much have access to the most of the world. However, there are some countries that still require you to have some extra documentation. Check out all the countries that require Americans to get a visa before they fly here.
In a reversal, Mike Tyson has been denied entry to the country whose indigenous Maori people he says inspired his facial tattoo.
Imagine being a shopper this time of year who finds they have no access to their Visa or MasterCard.