In The Walking Dead: The Ones Who Live, Season 1, Episode 5, "Become", Rick and Michonne come across a sign at Yellowstone National Park, Wyoming, that reads, "Protect the park from the people, the people from the park, and the people from the people."
The idea of protecting people from other people, in light of the episode's events, intrigues Michonne. I'm curious—is this sign actually found at Yellowstone, or is it fictional but based on a real-life text, or is it purely fictional?