This summary provides high-level information about the document in 3 sentences:
The document discusses a short story by Jack Finney called "The Third Level" where the main character Charley discovers a secret third level at Grand Central Station that transports him to 1894. On this third level, Charley encounters people in old-fashioned clothing and interacts with the environment and architecture from the 1800s. The story follows Charley as he tries to understand how he accessed this third level and what it could mean for escaping from the pressures of modern life.