This is probably the most exciting feet photo you've ever seen on Instagram.
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McNally, who told The Huffington Post he was standing on the railing of a support structure for the building's airplane warning lights, said the photo wasn't a work assignment -- it just "seemed like fun."
"My old battered shoes climbed the worlds tallest building today," McNally wrote on Instagram. "What an amazing structure! Tweeting from 820 meters straight up!"
At 828 meters (2,716 feet) tall, the Burj Khalifa is by far the world's tallest man-made structure. At just 508 meters (1,666 feet), the second-tallest building in the world, the Taipei 101 in Taiwan, doesn't even come close.
Here's what the Burj Khalifa looks like from a normal perspective: