National Geographic is your ticket to an exclusive,all-access journey into the vibrant heart of the sprawling transportation hub that became a legendary architectural icon. Go "Inside Grand Central" and explore the glamorous 130-year history and ambitious high-tech future of New York City's fabled rail terminal. Marvel at this "city within a city," encompassing 48 acres of prime real estate, 56 miles of tunnels and cavernous underground rail yards. From its early glory days to the challenge of countering modern-day terrorist threats, Inside Grand Central is an insider's look at one of the world's most remarkable and enduring landmarks.