The comma after safe doesn’t belong; delete it.
The entire place was calculated to make you feel safe and secure. It was, of course, all a terrible lie.
That’s the punctuation. Now let’s tackle the more subtle issue of word choice.
The first sentence doesn’t quite work. I know what it means, but that’s not what it says. Y’see, when choosing a verb, you should consider not only the meaning of the verb but also the meanings of the words around it. The verb calculated doesn’t work with place because places can’t be calculated.
Try one of these instead:
Every detail of the place was calculated to make you feel safe and secure.
The entire place was designed to make you feel safe and secure.