This command sets the location with the specified ID (location ID, not reference ID) either as cleared or uncleared. When a location is cleared, it will show up on the map and the game will think that you have discovered, or have 'cleared', the location before.
setlocationcleared [location id] [0 / 1]
|Location ID||The ID of the location you wish to set as cleared - note that this should be a location ID, not a reference ID.|
|0 / 1||Specify (without quotes) '0' to set the location as uncleared. Specify (without quotes) '1' to mark the location as cleared.|
setlocationcleared 0002004c 1
Anga's Mill Common House has the ID 0002004c. This command would set that location as cleared.
setlocationcleared 0002004c 0
Anga's Mill Common House has the ID 0002004c. This command would set that location as uncleared.