If you plan on travelling internationally, be sure you have everything you need to charge up your devices. This map shows what sockets are common in each country of the world and the plugs you'll need there.
The map, from Easysmart.com, even shows which countries may have multiple types. Keep it handy as a reference and you'll be able to guarantee all of your global travels are powered. For additional information regarding power outlet types around the globe, check out the link below.
World Map for Power Plug Types [Easysmart]