Correction for the height of The Washington Monument
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How long is 492 feet?
It's about nine-tenths as tall as The Washington Monument

The height of The Washington Monument is about 555.410 feet.
(Washington, D.C.)
The Washington Monument measures 555.410 feet tall, with some discrepancy due to the fact that the Monument's base is slightly below the surrounding ground. Interrupted in its construction by the American Civil War, it was almost 36 years between groundbreaking and the completion of construction.