Where does the ground wire go?

[SSSSnakes]

The ground wire is to prevent you or you animal from being electrocuted. If you touch a electrical wire that is hot, you get zapped. If you touch a neutral wire that has been broken, and the electrical current has went threw a load, (like a light), it can electrocute you. The ground wire is a second neutral wire to prevent you from being electrocuted. infernalis is correct in saying that technically, you should be using outdoor fixtures and connection with a ground fault outlet.

The ground wire is a very important safety feature that most people over look.