8. something that is or is kept secret, hidden, or concealed.
9.a mystery:the secrets of nature.
10. a reason or explanation not immediately or generally apparent.
11. a method, formula, plan, etc., known only to the initiated or the few: the secret of happiness; a trade secret.
12. a classification assigned to information, a document, etc., considered less vital to security than top-secret but more vital than confidential, and limiting its use to persons who have been cleared, as by various government agencies, as trustworthy to handle such material.
since you did not post any update on your question, assume that either you had find found this mystery place or don't need it any more, this thread served it purpose.