It seemed impossible ... but Nik and Lijana did it -- they walked a quarter of a mile over Times Square, balancing all the way on a tightrope.
The view looking down was incredible, and it was broadcast live on ABC. Thousands watched as Nik and Lijana met in the middle and he actually CLIMBED OVER HER -- around 18 minutes into the stunt.
It was especially daunting for Lijana, who broke almost every bone in her face after suffering a near-death fall a few years back.