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Iron Tower of Yuquan Temple was built in 1061 in what is now Dangyang County, Hubei Province, 113 years earlier than the Leaning Tower of Pisa. It was the first iron-cast leaning tower in China, also called Buddha Stupa. The tower was founded with pig iron, weighing 53 tons and 17.9 meters high. It is octangular and has 13 stories. While building the tower, the architects took into consideration the strong north wind in the area and intentionally gave the tower a 1.5-degree slant north. As a result, the tower still stands erect after experiencing wind and rain for nearly 1,000 years.

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