How to hide posts?

Hi all
Is there a way to have a post but for it not to be visible on the main page?
What I need is to be able to have the post available as a separate page that can be linked from the main page but to still keep the original format. Does that make sense?
The idea is that I can post a single image (within a single post) out of a gallery and be able to link to ALL of the pictures that are contained in the other hidden post.
I don’t want the user to have to download the whole lot unnecessarily
I hope that makes sense to someone, I don’t know how else to explain it!
Thanks,
Reevo