The Brick Outhouse

I caught a few minutes of a show about a prison yesterday.  One thing I noticed were the white walls made out of blocks.  They looked like they could survive a tank blast or two.  Oddly, the thought of a brick sh*thouse came to mind.  I don't remember when I've ever heard the phrase "built like a brick sh*thouse" or where I heard it.  Are there really brick sh*thouses?