Taiwan's tallest building is protected by a 660-ton pendulum.

A 660-ton steel sphere hangs between the 87th and 92nd floors of Taiwan's tallest building. The pendulum protects against earthquakes and high winds by moving about 5 feet from side to side. The Taipei 101 building is the tallest building in the world, reaching a height of 1,667 feet. This story is available only to Business Insider subscribers.