It's minus six degrees, thanks to the city's first winter storm, and snow covers the rows of tributes: teddies, pictures, flowers, notes. It's also 18 weeks since this generation's 'Where were you when Kennedy was shot?' moment, yet still the queue snakes around the corner and up Broadway as far as City Hall. Such is the demand to see the remnants of the North and South Towers that despite picking up a ticket from the pier at 1pm, our viewing slot is not until 5.30pm.