We all dream of visiting exotic countries. However, you can't just fly off on a whim and expect everything to be all right after you return home. Some countries require entry visas. There are places that can pose health risks to you.
Some travel does require health certificates and certain immunizations.
That means that you should have your boosters of Tetanus-diphtheria every ten years, as well as Hepatitis B vaccine if you did not receive it as a child. Some people also received measles vaccine as children that did not confer life-long immunity. This should be checked and if you are not immune, have the vaccine. You also may want to consider having the flu vaccine and Enhanced Inactivated Polio Vaccine, which is given only once during adulthood. Some areas of the world do require other special health and immunization certificates.