[Answer] What landmark was temporarily closed in 1990 because it was thought to be in danger of collapse?

Step 1 : Introduction to the question "What landmark was temporarily closed in 1990 because it was thought to be in danger of collapse?"

...The Leaning Tower of Pisa is one of the most famous buildings in the world, although maybe not for the reasons its original architects would have wanted. It began leaning shortly after construction began in 1173. By 1990, it was leaning 5.5 degrees – the most extreme angle yet. That year, the monument was closed to visitors as engineers worked to stabilize it. The structure was stabilized which reduced the tilt to 3.97 degrees. Engineers now believe the Leaning Tower of Pisa will remain stable for some 200 years, barring an earthquake or other unpredictable disaster.

Step 2 : Answer to the question "What landmark was temporarily closed in 1990 because it was thought to be in danger of collapse?"

Leaning Tower of Pisa:

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