Ralph Fiennes was apparently nonplussed at the idea of appearing in the fourth film of the Harry Potter series and stated that he had “never bought into [the] world of Harry Potter”. He eventually changed his mind after Goblet of Fire director Mike Newell showed him preproduction conceptions of what the character of Voldemort might look like.
“The little kid in me that likes to dress up and be bad went ‘Yeah! I want to do it!’”.
The Slytherin Dungeon is located behind a wall in the cellars of Hogwarts School of Witchcraft and Wizardry. A password spoken to the wall is required to enter it; whereupon a passage is revealed leading to the common room — a low-ceilinged, dungeon-like room with greenish lamps and chairs. This dungeon extends partway under the lake (which is why it has green-coloured lamps). The common room has lots of low backed black and dark green leather sofas with buttons, skulls, and dark wood cupboards. It has quite a grand atmosphere, but also quite a spooky, cold one. It’s last known password was Pure-blood.