The North Korean Babel, the Ryugyong Hotel, is the world's 28th tallest building. After sucking 2% of the country's GDP for years, this shell of a pyramid-cum-skyscraper is #1 on my my new list of the 7 Decrepit Wonders of the World. The best feature may be the 9 Revolving Restaurants. If Gustave Dore' (shown) or Piranesi were here...