Griffith Park (Old L.a.) Zoo in Los Angeles was in existence between 1912 and 1966. When it opened, there were only 15 animals. The zoo grew as many movie star animals retired here. Today, it is a popular hiking and picnic spot among ruins. Many of the enclosures were built during the Great Depression by the Works Progress Administration. It greatly captures the progress and improvement in zoos today. The cages are tiny and claustrophobic and allow the visitor to feel what it would have felt like to be an animal here. Although grotesque, this is an essential and fascinating experience.