What are the best alternatives to Certificates of Deposit?

I am in my forties and debt free. I have kept tens of thousands of dollars(practically all my savings) in CDs for years. I am seeking alternatives because of the terribly low interest rates. I am considering rental real estate--a duplex or four-unit building to start. I do not really like or trust the stock market. Is it possible to buy CD-like instruments in a stable foreign country like Austral;ia or Canada? Are there any alternatives other than CDs?