Step 1: Context:
In 'The Third Level' by Jack Finney, Charley, the narrator, claims to have discovered a mysterious third level at Grand Central Station that leads back to the year 1894.
Step 2: Why it symbolises escape:
Grand Central Station, with its vast, maze-like network of tunnels and levels, becomes a symbol of escape from the tension, anxiety, and complexity of modern life. Charley — anxious, insecure, and worn out by the pressures of the present — imagines/finds a 'third level' that leads to a calmer, simpler past, representing an escape into nostalgia rather than a literal, physical place.
Final Answer:
The Grand Central Station symbolises escape because its confusing, endless corridors become, in Charley's mind, a gateway out of present-day anxiety into an imagined, peaceful past.