Have you ever heard of iceberg pages? They are pages that you have created but may not automatically want to display in your menu section. However, they play a vital role, especially with search engines.
Jerry has done an excellent job at showing examples with his own website. My favorite? The one about special events.
Read and bookmark, it's pure gold!
The article is at http://doktorspinn.com/2014/11/06/iceberg-pages/