4. Not checking immigration requirements
There are still a good number of countries (Russia and Brazil, for instance) that require a visa for entry, and many countries require that your passport be valid for at least six months from the date of your entry. Still other countries require that there be a blank page in your passport for their stamps — in some instances, even the location of this page matters (for example, it might need to be the last page).
How to avoid: Well in advance of your trip, contact the embassy or consulate of your destination country and determine its immigration requirements.
5. Paying high credit card foreign transaction fees
With some cards, both the credit card company and the issuing bank charge foreign transaction fees. In addition, there are fees for having charges automatically converted to U.S. dollars at the point of purchase (called "dynamic currency conversion"). These fees add up quickly.
How to avoid: Read the small print on your credit card agreement to determine what fees are charged. If there are multiple fees or the percentages are high, shop around for a card with better terms. When charging items abroad, be sure to ask those you are paying to make charges in the local currency.
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