Last week’s question of the week was, “What is now the largest building in the world?” The answer was the Khalifa Tower. Two guys recently went basejumping off the top of it. And while we find the Burj Khalifa impressive, it’s still not our favorite skyscraper. That honor belongs, of course, to the Ryogyong Hotel.When I wrote about it a few years ago, it looked like it would never be completed and instead an empty building would dominate the skyline of Pyongyang. But an Egyptian firm started working on it last year, and have actually installed windows, and it is slated to open in 2012. Here is the hotel website. Americans will not be welcome.