An Austrian man tip-toed along a line strung 607 feet off the ground in Frankfurt on Saturday, attempting to set a new world record for "highlining" despite his fear of heights. Reinhard Kleindl, 32, used only his arms to balance as he walked twice along a 98-feet-long polyester rope anchored to the two wings of Frankfurt's U-shaped skyscraper Tower 185 above hundreds of cheering supporters.