Don't look down: Daredevils climb world's second-tallest building without safety gear

Taller than two Eiffel Towers, but who needs a rope?

One year ago, Vadim Makhorov and Vitaly Raskalov terrified acrophobics everywhere with their stunning video of a safety-free climb of one of the world's tallest buildings.

Now they're back to do it once again - on an even taller one.