Gold has historically been used in coinage and jewelry. It has always held its value, as have most precious metals, and has always been in demand amongst every walk of life.
There are several different types of gold to buy when looking at a long term investment. Gold bullion comes in the form of gold bars and gold coinage. There are also several ways to store and protect your gold. Another advantage of gold bullion is that the value is retained and generally increases over time. Gold also attracts less of a tax problem as well.
When choosing gold, you should identify the form of bullion you will be purchasing and diversify the types of bullion you purchase. Buying gold is always a sound investment and is sure to be an investment that you won't regret.