The CN Tower is a communications and observation tower located in Downtown Toronto, Ontario, Canada. It has a height 553.33 meters (1,815.4 ft) and it was built in 1976. At the time it was the world's tallest free-standing structure and world's third tallest tower. It kept both records for 34 years until the completion of the Burj Khalifa and Canton Tower.

On August 1, 2011, the CN Tower opened the "EdgeWalk." There, thrill-seekers are strapped in to a harness that is attached to a guard rail. The catwalk on and around the roof of the main pod of the tower is at a height of 356 meters (1,168.0 ft), which is directly above the 360 Restaurant.

A reporter leans over the edge of the catwalk during the media preview for the quotEdgeWalkquot on the CN Tower in Toronto
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. Participants are strapped in to a harness that is attached to a guard rail while walking around the catwalk on the structure 356m (1,168ft) off the ground. Reuters
A reporter leans over the edge of the catwalk during the media preview for the quotEdgeWalkquot on the CN Tower in Toronto
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. Participants are strapped in to a harness that is attached to a guard rail while walking around the catwalk on the structure 356m (1,168ft) off the ground. Reuters
A reporter leans over the edge of the catwalk during the media preview for the quotEdgeWalkquot on the CN Tower in Toronto
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. Participants are strapped in to a harness that is attached to a guard rail while walking around the catwalk on the structure 356m (1,168ft) off the ground. Reuters
Photographer Mark Blinch works on the catwalk during the media preview for the quotEdgewalkquot on top of the CN Tower in Toronto
Photographer Mark Blinch works on the catwalk during the media preview for the "Edgewalk" on top of the CN Tower in Toronto, July 27, 2011. Participants are strapped in to a harness that is attached to a guard rail while walking around the catwalk on the structure 356m (1,168ft) off the ground. Reuters
Photographer Mark Blinch is seen before the media preview for the quotEdgewalkquot on top of the CN Tower in Toronto
Photographer Mark Blinch is seen before the media preview for the "Edgewalk" on top of the CN Tower in Toronto, July 27, 2011. Participants are strapped in to a harness that is attached to a guard rail while walking around the catwalk on the structure 356m (1,168ft) off the ground. Reuters
Photographer Mark Blinch works on the catwalk during the media preview for the quotEdgewalkquot on top of the CN Tower in Toronto
Photographer Mark Blinch works on the catwalk during the media preview for the "Edgewalk" on top of the CN Tower in Toronto, July 27, 2011. Participants are strapped in to a harness that is attached to a guard rail while walking around the catwalk on the structure 356m (1,168ft) off the ground. Reuters
Photographer Mark Blinch works on the catwalk during the media preview for the quotEdgewalkquot on top of the CN Tower in Toronto
Photographer Mark Blinch (R) works on the catwalk during the media preview for the "Edgewalk" on top of the CN Tower in Toronto, July 27, 2011. Participants are strapped in to a harness that is attached to a guard rail while walking around the catwalk on the structure 356m (1,168ft) off the ground. Reuters
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