'Door' in the Bible

Then Nebuchadnezzar came near the door of the burning and flaming fire: he made answer and said, Shadrach, Meshach, and Abed-nego, you servants of the Most High God, come out and come here. Then Shadrach, Meshach, and Abed-nego came out of the fire.

And I saw in the vision; and when I saw it, I was in the strong town Shushan, which is in the country of Elam; and in the vision I was by the water-door of the Ulai.