Big pants, golden eggs, welcome to China's 'starchitecture'

"Rumor has it," my guide whispered to me, as I stared down through the glass floor, where the rest of the building should have been, "give it a good shove, and the whole tower would just tip over".

Once seen, the CMG building in Beijing, home to China's CCTV State-run television network, is hard to forget. It's like a 234-meter M.C. Escher painting. Or Jenga game gone wrong. Locals affectionately call it "the big pants".

Two towers support what the developers ominously call The Overhang, where several floors of office space juts out into thin air. The whole thing shouldn't stand up. It defies logic. Which is why I was so unnerved. Especially standing on a glass window.