Buffy & Angel: Hellmouth Haunt was one of the mazes that took place in Halloween Horror Nights 2000 (hollywood)
Description: An attraction created by the creators of the WB Network's series "Buffy the Vampire Slayer" and "Angel".
Basically, the guests become part of an episode of Buffy, where they explore some of the sets from Buffy, including Buffy’s dorm and Sunnydale Park. They walk through those sets and experience them and then they go through a subway, and when they get off the subway they end up in Los Angeles in Angel’s world. They experience Angel’s apartment, and some of the other settings from that show.