There are many long term money investment plans and options. Of all those, investing in gold is one of the best options for the long-term according to my opinion because gold is the popular one as an investment. One can invest in gold in various forms like physical gold, gold bonds, digital gold, gold ETFs, etc. Purchase gold coins or gold bars if you want to invest in physical gold. Gold bars usually come in standard denominations like gold bars 1oz, 1 kilo, 10 oz while gold coins come in 1 gram, 5 grams, 10 grams. Whatever the option may be, make sure that the money you invest is safe.