Abu Dhabi (the capital of the United Arab Emirates), as well as Dubai and other place names, have "architecture" as their hottest matching keyword. The most eye-catching buildings and plans appear in these wealthy places that are literally swimming in oil. This time, Abu Dhabi has invited four heavyweight designers: Zaha Hadid, Frank Gehry, Tadao Ando, and Jean Nouvel to design cultural buildings for the Saadiyat Island cultural district.