I do not believe that there is such a thing. If you have a POA granted in a proper manner and validated by your own court system (not that they HAVE to be validated) it is good anywhere.
There are absolutely no guarantees that a third party will accept your Power of Attorney document that has been validated by your own court system. A POA executed in one country is not necessarily accepted anywhere. You may need to contact the consulates of the countries you plan to visit to determine whether your POA document meets the standards in those countries. You also need to ask yourself some questions
What exactly are you looking to accomplish? Are you going to be traveling the world and wanting a companion to sign everything for you or be able to obtain medical care in an emergency? Do you need to send an agent to other countries, one who can sign legal documents on your behalf? In that case, the agent may need to be registered. On such an important matter you should consult with an attorney who could review your situation, discuss your needs and determine what documents or certifications you will need.