One of the greatest free solo climbers of all time, Alex Honnold, is about to risk everything to scale the Taipei 101 skyscraper — one of the tallest buildings in the world.

American climber Alex Honnold has successfully scaled a Taiwan skyscraper without a rope, harness or safety equipment.

Honnold’s climb featured three stages: the Slabs, the 372-foot base of the building, known as the easiest aspect and warmup of the ascent; the Bamboo Boxes, featuring eight balconies and 900 feet of a...