Head Master's Office
"She proceeded to a gargoyle in the halls, and says the password ("Sherbert Lemon"), whereupon the gargoyle lept aside, revealing a slowly ascending circular staircase. Reaching the top of this, they found an oaken double door. Professor McGonagall left Harry there. Harry saw that the room contains a vast number of portraits of past headmasters, all evidently asleep; many spindly tables with intricate silvery devices upon them; and the Sorting Hat resting on a shelf. After exchanging some words with the Sorting Hat, Harry notices a very ill-looking bird on a perch behind the door; as he watches; aghast, the bird catches fire. Professor Dumbledore, then entering, tells Harry that the bird, Fawkes, is a Phoenix, and that is his method of immortality; he will shortly be reborn from his own ashes."