The View From Inside Paul McCartney's 'Secret' Grand Central Station Show

Walking through the warm, vanilla hallway of Grand Central Station, I tried to enter a barricade when an army sentry — helmet, muted green-and-sand uniform, a pistol and a big machine gun — said it was the wrong entrance. "This is for the artist — go down, take a left and stick to the wall."

Around the corner to the right, a small island's worth of people stood smiling, pushed up against a barricade with their phones out, asking if it was