Nik Wallenda crossed the Grand Canyon like this. It was a slow step by step crossing.
Here several attractive ladies slacklining at Yosemite. One is even doing the splits.
Which looks more dangerous and exciting? 
Is Nik Wallenda too old school compared to the current slackliners?
Hayley Ashburn quite a few tricks on the slackline.
More girls on the highline.