Teletorn

Up to 4 people can walk at a time on the ledge of the TV Tower’s 22nd floor, at a height of 175 metres.
Visitors walking the ledge are attached to the attraction with safety harnesses.
One walk may last up to 30 minutes and participants will have their photos taken, which they can request to be sent to them by email free of charge.

Source: http://www.teletorn.ee/index.php?option=com_content&view=article&id=192&Itemid=21
Picture source: Teletorn

You can visit the TV Tower you can if you book our tour: “TV Tower Tour” http://tripity.eu/tour/tallinn-tv-tower-tour/, for an extra charge it is possible possible to walk along the edge of the TV tower, or go down the rope.