First time in Taiwan? We select 4 must-visit attractions for you. Taipei Old Street, mouth-watering steamed dumplings, the famous monument, and of course, there is one remarkable symbol you can see from almost everywhere in Taipei. That is Taipei 101, which used to be the tallest building in the world. And if you see the color of it, you can tell what day of the week it is. Each color from rainbow represents Sunday to Monday respectively.