You might want to explore investing in a foreign-laden mutual fund of some sort. It would probably also make sense to figure out exactly which foreign areas/entities you are investing in and why…as well as the term length of your investment. The previous statement may sound redundant, but it can really help to narrow down your choices.
It might be beneficial to consult with a professional about it if you are still unsure. Afterall, they are the ones that research this stuff on a daily basis. This site’s host specializes in this sort of thing (I am not affiliated with his company). If you are a do-it-yourselfer, there is an absolute mountain of data (some free, some not) concerning foreign investments. Either way, I wish you the best of luck in your endeavors.