Stair races are reaching new heights—literally. Once a niche fitness test for the ultra-committed, the sport now boasts over 200 annual events globally, with more climbing onto the calendar each year.

Vitaliy Raskalov, 22, and Vadim Makhorov, 25, scale tall buildings and bridges around the world, snapping photos from the top of them. They climb buildings without safety ropes or harnesses.

People went up dozens of flights and hundreds of stairs for this year’s “Fight for Air Climb.” The event was held at One Oxford Centre along Grant Street in Downtown Pittsburgh. Climbers ...

Despite numerous warnings by authorities, reckless daredevils continue to flout the law in Dubai by illegally climbing skyscrapers around the city. In a video posted on YouTube last week ...