A word of warning: buy international luxury goods in Taipei and you'll likely pay more than you would were you coming to the city from the U.S. or Europe. With that in mind, it IS fun to wander this gleaming, luxe mall gazing at Armani, Prada and all the other mortgage-damaging brands it carries. Plus, you can can zip up to the 89th-floor observatory (on the fastest elevators in the world) for a bird's-eye view of the city.Two other reasons to head here: the complex is home to one of the city's Din Tai Fung outlets and the city's best English-language bookstore in Page One.