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.
Be careful not all spirits are benevolent and some look quite grotesque, you need to be specific and not generalize because if
you saw some really dark evil entities it will shock worse than
any horror movies you have ever seen and remember what you would
be seeing is REAL and not made up!!!!!!