While recent flooding may cost 1% of GDP in Poland, it was the only country in the EU to grow last year. The OECD forecasts growth of 3.1% this year and 3.9% next year. The zloty is a volatile currency though and tends to tumble when markets grow nervous. With that volatility in mind, this is the sort of investment that should be undertaken only by those with hefty risk tolerance, since although the long term looks healthy, volatility in the near term could still weigh heavily on these ETFs. -- Written by Don Dion in Williamstown, Mass.