Access to virtually all of the three zoned main ruin is blocked by a locked door which cannot be picked until you begin the college of winterhold quest revealing the unseen.
Skyrim mzulft aedrome locked door.
The first locked door s key is through the door on the opposite side of the room.
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Defeat it and the key.
Mzulft boilery in a master locked room it can be grabbed with telekinesis through the bars without entering the room opens the door to the room it is in and an expert locked door a little further along in the boilery.
Opens a door leading toward the mzulft oculory from the main section of mzulft aedrome.
In the mzulft aedrome after paratus decimius opens the door to the oculory he may stand there even after telling him about the focusing crystal and he expects to be followed.
It is found along the western side of the mountains of eastmarch.
Go all the way to the end of that path and there will be a boss that depends on your level.
Having trouble finding the key.
It is the location of one of two oculories in skyrim the other is deep underground in blackreach and this feature in particular made it a target of a secret project conducted by the synod.
This can be fixed by shouting at him and if that does not work try reloading and making sure he opens the door.
This ruin cannot be explored unless the dragonborn has been sent here by mirabelle ervine to retrieve the staff of magnus as part of the quest revealing the unseen because the key required to unlock the inner door after entering mzulft is found on the body.
It is quite a distance southeast of windhelm and a short distance directly north of cragslane cavern.