Alex Honnold says he needed to know if scaling the Taipei 101 was even possible before he did Netflix’s "Skyscraper Live" special, so he turned to a more traditional way of climbing to find out.

Since the start of Adam Ondra's climbing career nearly 30 years ago, he has become one of the most prolific climbers in the world. In 2017, he made the first ascent of Norway's 5.15d Silence route, ...