The problem with Gold, as real as it is, is that most people would rather carry around slips of paper that represent gold promises, than the actual gold itself. There's also significant risk in securing/hiding it if you amase any reasonsable amount.
That's the risk on how you can secure your investment, if people will know that you are hiding a precious gold in your house that is not good for you and your family as you are prone to a big risk of robbery by the bad people. Better shift to bitcoins, you will be safe here and might make big income than gold.