What's with people's reliance on Spells? Why not use your own skills to see em?
I don't think any spell would reveal or make any spirits visible to you, sorry.
Darkin0angel, open your 6th chakra, learn to etheric project, and you'll be able to see them, it DOES take a long time to learn (I still cannot see, but I can feel things in the etheric)
Here are some links to help you, note, that growing all your chakras are better than just growing the 6th (3rd eye) because they interact with each other.
And last of all, very important, Meditation, calming yourself before you do this stuff helps you focus, and keeps influences away.