Russian daredevils Vitaliy Raskalov and Vadim Makhorov take on the world's second tallest building - the 2,073-foot tall Shanghai Tower.

The duo climbed right up to the construction crane at the top of the building, which is still under construction.

The video starts off with the two inside the building, but when they start climbing around on the top, and show you a view of what they're looking at, it's absolutely gut-wrenching.

Check out the pictures they took on their blog, and watch their ascent in the video below: