I didn't know that there is power armor next to commonwealth weaponry in diamond city. It doesn't disappear when you enter it so you can take it as many times as you want.

Speaking of Power armor, I didn't know Raiders had their own brand of power armor... but now I have a set, eh?

Also, I didn't realize legendary opponents would start appearing at level 12 or 13. In fact, I never ran into a legendary anything until my second character (who isn't yet as high level as the first one was) ran into a "Legendary Feral Ghoul Reaver" at level 12.

I didnt know that Raiders will use Fatmans at POINT BLANK RANGE!!!

I remember my surprise at the "Touchdown" achievement.

Ha ha, Bethesda.

Very funny.

That you can "Tame" animals (And people? not unlocked that perk yet)

That there is a female version of the mr handy (Mrs nanny)

There is a secret military complex under the glowing sea.

In power armour, you can walk at the bottom of lakes and rivers like one of those olde timey deep sea divers.

You can equip Dogmeat in (dog) armor, googles and/or a bandana. He can also fetch useful things for you.

I didn't know that an easy way to keep track of your armor/weapons in your inventory without favorting them to the hot bar is to simply go in to rename them to what ever you want, until my coworker suggested it. I just ad an * to the front of the name.

Have you been to that military complex?

Yes, i found it by myself, the power armour in said complex got me all giddy and excited.

Do you have an approximate location or is it fairly easy to find in the glowing sea?

Look out for a small abandoned shack at the bottom left area of the map.