You can still use it to indicate movement toward a place. It is used to indicate the future when used with another verb, if it's used by itself it will indicate movement (most of the time, see below). "I'm going to Spain" > "I'm moving towards Spain" "I'm going to go to Spain" > "I will go to Spain" "I'm going to the Mall" > "I'm moving towards the Mall" "I'm going to go shopping" > "I will go to do the action of shopping" going to used by itself can indicate future depending on context: "Are you going to do your homework?" "Yeah, I'm going to..." The verb has been omitted in this case, and can be inferred from context.

In the spoken language: Note that as an auxiliary, the pronunciation of “going to” is almost always reduced to /gʌnə/ (but please don’t write “gonna” unless you’re a teenager sending an SMS to another teenager). On the other hand, we always use the full pronunciation when it is the main verb.