That is a tax sale, it is rare that a property is sold at tax sale, if there is a mortgage the bank will pay the taxes before it gets to that to secure their position. It happens more on land than houses. Old lots, people who own them out right and cant pay the taxes, dont care to or what ever. You should check with your county courthouse or with indivisual towns or cities for a list of properties comeing up or that they are holding
You can find those through the county. It is extremely rare that you actually end up with the property but it can be an alright investment since you get paid a percentage on your money once the taxes are paid.