EdgeWalk

A reporter leans over the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011. (Reuters/Mark Blinch)

A reporter leans over the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011.  (Reuters/Mark Blinch)

A reporter leans over the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011 (Reuters/Mark Blinch)

A reporter leans over the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011.  (Reuters/Mark Blinch)

Reports lean back over the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011.  (Reuters/Mark Blinch)

A reporter leans over the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011. (Reuters/Mark Blinch)

A reporter leans over the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011.  (Reuters/Mark Blinch)

A reporter leans over the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011. (Reuters/Mark Blinch)

Reporters walk on the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011. (Reuters/Mark Blinch)

A reporter walks on the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011. (Reuters/Mark Blinch)

A reporter leans over the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011.  (Reuters/Mark Blinch)

A reporter leans over the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011.  (Reuters/Mark Blinch)

Reporters lean over the edge of the catwalk during the media preview for the 'EdgeWalk' on the CN Tower in Toronto, July 27, 2011.  (Reuters/Mark Blinch)

Canadian Press reporter Alex Posadzki leans over Toronto's downtown while participating in a media preview of EdgeWalk on the CN Tower on Wednesday, July 27, 2011.  (AP/Darren Calabrese)

The Rogers Centre is seen from 1,168 feet over Toronto's downtown during a media preview of the EdgeWalk attraction on the CN Tower, Wednesday, July 27, 2011. (AP/Darren Calabrese)

Reporters lean back, 1,168 feet over Toronto's downtown, while participating in a media preview of the new EdgeWalk attraction on the CN Tower Wednesday, July 27, 2011.  (AP/Darren Calabrese)