Koryn Wicks' "Ghosts in the Machine," which uses augmented reality technology, takes participants up stairs, around pathways and into now-deserted enclosures. It's a haunting way to explore the park.

Los Angeles (CNN) — Griffith Park is a massive, mountainous, wild oasis in the middle of the dense urban sprawl characterizing much of this fabled city. Yet its identity is still very LA — fun, sunny ...