A building in El Paso, Texas is the site of a century old mystery. On the side of the building: a mural of a turtle. Was it a symbol? In the building's basement: walled off tunnels. Who were they for? Where did they go? This is the Backstory.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.