Taipei 101 is one of the landmark buildings in Taipei and even Taiwan, and one of the must-visit attractions. It was once the world's high tower. You can see the scenery of Taipei from a distance at the top of the tower. You must buy tickets to the tower and wait in line. The observation deck is on the 91st floor, which is an outdoor observation deck with the best viewing angle. The 89th floor is the indoor viewing floor. It is recommended to arrive around 5 pm, so that you can see both the morning view and the night view.