During the kingdom of Khazad-dûm, the subterranean realm was full of light and splendour, illuminated by many shining lamps of crystal. The higher levels had skylights carved through the mountain-side which provided daylight. The East-gate or the Dimrill Gate was the main entrance, looking over Dimrill Dale. It opened into the First Hall of Moria. The West-gate enabled travellers to pass right through the Misty Mountains, thus providing a weather-free alternative to the notorious and arduous Redhorn Pass, 15-20 miles to the north. The J.R.R. Tolkien Encyclopedia notes that Middle-earth gates are important both symbolically and practically: They mark exclusion or admission. They test character and wisdom. They suggest mystery, secrecy, and privilege.