Taipei 101 is a landmark supertall skyscraper in Xinyi District. The building was officially classified as the world's tallest from its opening in 2004 until the 2010 completion of the Burj Khalifa in Dubai but is the tallest and largest green building in the world. Its elevators, capable of 60.6 km/h to transport passengers from the 5th to 89th floor in 37 seconds, set new records. The structure regularly appears as an icon of Taipei in international media, and its fireworks displays are a regular feature of New Year's Eve broadcasts.

Taipei 101's postmodernist architectural style evokes Asian traditions in a modern structure employing industrial materials. Its design incorporates a number of features that enable the structure to withstand the Pacific Rim's earthquakes and the region's tropical storms. The tower houses offices and restaurants as well as both indoor and outdoor observatories. The tower is adjoined by a multi-level shopping mall that claims the world's largest ruyi symbol as an exterior feature. 

A major feature of the 101 is a 660-tonne steel pendulum that serves as a tuned mass damper, built at a cost of NT$132 million. Suspended from the 92nd to the 87th floor, the pendulum sways to offset movements in the building caused by strong gusts. Its sphere, the largest damper sphere in the world, consists of 41 circular steel plates of varying diameters, each 125 mm thick, welded together to form a 5.5 m diameter sphere. Two additional tuned mass dampers, each weighing 6 tonnes, are installed at the tip of the spire which help prevent damage to the structure due to strong wind loads. On 8 August 2015, strong winds from Typhoon Soudelor swayed the main damper by 100 centimetres – the largest movement ever recorded by the damper.

The damper has become such a popular tourist attraction, the city contracted Sanrio to create a mascot: the Damper Baby. Four versions of the Damper Baby: "Rich Gold", "Cool Black", "Smart Silver" and "Lucky Red" were designed and made into figurines and souvenirs sold in various Taipei 101 gift shops. Damper Baby, with its cute all-ages appeal, has become a popular local icon, with its own comic book and website.