Putting your nest egg cash in stocks and shares is the obvious choice if you're keen to increase your wealth long-term. With average cumulative returns ranging from 61% (S&P 500) to 70% (FTSE 100) over the last 10 years, the stock market seems a relatively reliable bet. Yet your money could have gone a lot further elsewhere. Here are 25 alternative investments that have turned an even bigger profit during the past decade.