Anyone find any secret world puzzles yet?
I think theres one for a bird mount in the plains. It’s the same model as the god they worship.
There’s probably something.
They found the secret BM Hunter spirit beast of Dragonflight within the last day or so
One thing I genuinely miss from WoD was the puzzles, though plenty of them were a little too annoying, many of them also offered unique rewards in addition to just some garrison resources. I was saddened when the treasure chests in Legion were all mostly easy to get to and only ever contained some artifact power and vendor trash.
Heres a not too well known mount, look up the “lucid nightmare” on wowhead or if you are really ambitious look up “hive mind” if attempting to grind for that one.
I’m holding onto the lucky horseshoe I nabbed from a centaur vendor. It gives a ‘lucky’ buff. I have a feeling it’s part of something.
Not exactly secret, but the Hidden Hornswog Hoard starts with a riddle and you have to collect the things needed to make the Hornswog happy.
He is not far from the Ruby Pools up top.
pretty sure everyone who has been playing since legion is aware of those.
i think the op is asking about current content. 
the ones which are currently known, are listed in the “All The Things” addon