The most surefire way to become a millionaire retiree (aside from actually starting with a million dollars) is to invest in stocks that consistently generate strong returns, and allow your gains to compound for decades. Certain real estate investment trusts, or REITs, make particularly great retirement investment. Here’s why REITs are great stocks to hold in retirement accounts, and two examples that could be great investments for you, both of which are cornerstones of my own retirement portfolio.