A smart alternative to buying little green houses in states you would never want to visit is to invest in a syndicated apartment complex (think: red hotels).
Apartments are better investments than houses because of the economies of scale: maintenance is cheaper, occupancy and therefore income is more stable, the number of units you own = the amount of diversification you have, and banks love to lend on them.
Keep in mind, apartments are one of the most stable (read: safe) investments an investor can make. That is why pension funds and insurance companies LOVE to invest in them; because theirs is an ultra conservative "can't lose" strategy.
Apartments are a great hedge against inflation. Banks love to lend on them, Uncle Sam gives all kinds of tax benefits, your tenants retire your mortgage and pay all your expenses INCLUDING maintenance and capital improvements, they cash flow, and they appreciate.
Most of my investors realize an 18% annualized return or better on the apartment deals we do (**includes cash flow distributions, principle reduction, appreciation, and tax benefits) and never have to qualify for a loan or fix leaky toilets.
Smart investors have some kind of multifamily investment in their portfolio.