The world economy has time and again been threatened by unstable financial conditions. This time, the Greek debt issue is giving everyone the jitters. This need not be if one's investments are in something solid and tangible such as precious metals like gold.
Gold has been a favored commodity for centuries. In contemporary times, gold remains a sought after investment item to protect one's wealth against inflation thus preserving one's purchasing power. Paper currency no longer has that capability.
The United States Gold Bureau is one place to buy gold bullion. You can get more information on how to invest plus other recommendations pertaining to precious metal investments.