Penetralia ([pural] noun)
penetralia [pen-i-trey-lee-uh]

[plural] noun
1. the innermost parts or recesses of a place or thing.
2. the most private or secret things.

Origin: 1660-70; < Latin, noun use of neuter plural of penetrālis inner, equivalent to penetr (āre) to penetrate + -ālis -al

Now YOU come up with a sentence (or fic? or graphic?) that best illustrates the word.