Bowerstone Castle Gold door
it's in the escape route that you go through at the beginning of the game, but you won't be able to open it till your the King/Queen though. You'll acquire a large sum of gold. Moringwood Gold Door
you can only get to this door after completing one quest and then starting another that appears as a result of said previous quest that gives you access to a previously unknown and inaccessible entombed area. you'll receive a powerful rifle. Sunset Mansion Gold door
this one is easy to find. it's east(right) of the mansion, near a silver key. yoi'll get a sword. Brightwall(The Reliquary) Gold Door
It's in The Reliquary of Brightwall's academy. This one's a bit harder to find as well as to get to and for good reason. however it's not really worth the trouble, and should be the LAST Gold Door you open When you first enter this The Reliquary you see a hallway filled with bookcases, and a door at the end leading to a large spiral stairwell like area with a sort of pillar in the middle. it's on one side of that middle section that you'll find the gold door. After you cross the bridges connecting the middle section of the room there is a stair to your Right. At the bottom there will be a silver door to your left leading to yet more stairs a chest and another silver door that requires a key you get from a quest that results from another quest that starts in the Dweller Camp. You'll need to do both quests in order to get to the gold door. To your right it will seem like nothings there until you look diagonally down towards the middle section. You should see the gold door. Now remember the silver door up the stairs to your left that requires a key. on the other side is a room filled with book cases, and a flit switch that you might not notice your first time in seeing as it's above some book cases. Shoot it multiple times and it'll open a door. The rest should self-explanatory, or in other words you should be able to figure out the rest. there are five chests each filled with some articles of clothing that technicly anyone can get in brightwall early on in the game.