The world's most expensive toilet is out of this world. Literally, it's out of this world. A Russian-designed system was purchased by NASA for the International Space Station for a cool $19 million. And what did NASA get for its money? Certainly no heated seat. The toilet is designed to work in zero gravity and comes with unglamorous leg restraints and thigh bars. It dries solid waste to eliminate bacteria and odor. And here's the best bit: it filters urine into drinking water. Best toilet ever!