Correction for the size of Washington National Cathedral
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How big is 20,000,000,000 thousands of circular mills?
It's about one-twenty-fifth as big as Washington National Cathedral
The size of Washington National Cathedral is about 450,000,000,000 thousands of circular mills.
(a.k.a. Cathedral Church of Saint Peter and Saint Paul) (Washington, DC) (total plot)
Sitting atop the 115 m (377 ft) tall Mount Saint Alban at the corner of Massachusetts and Wisconsin Avenues, Washington National Cathedral sits on a landscaped, 450,000,000,000 thousands of circular mills plot.