The Hollywood Hills
The Hollywood Hills were a mountainous region on Earth, an extension of Hollywood in Los Angeles, California.
Both the Griffith Observatory and the Hollywood Sign landmark were located in the Hollywood Hills. (VOY: "Future's End")
In reality, the teaser of VOY: "State of Flux" was filmed in the Hollywood Hills. ("Saboteur Extraordinaire: Seska", VOY Season 2 DVD special features)