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1. en.wikipedia.org › wiki › Washington_MonumentWashington Monument - Wikipedia

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   1 day ago · The Washington Monument is a hollow Egyptian -style stone obelisk with a 500-foot-tall (152.4 m) column surmounted by a 55-foot-tall (16.8 m) pyramidion. Its walls are 15 feet (4.6 m) thick at its base and 11⁄2 feet (0.46 m) thick at their top.

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   Why was the cornerstone laid below the ground level?

   • Robert Mills, the architect of the monument, stated in September 1848, "The foundations are now brought up nearly to the surface of the ground; the second step being nearly completed, which covers up the corner stone." : 20 Therefore, the cornerstone was laid below the 1848 ground level.

   Washington Monument - Wikipedia

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   What were the walls made of during the second phase?

   • During the second phase (1879–1884), the walls were constructed of smoothly dressed ( ashlar) large marble and granite blocks ( rectangular cuboids) laid down in an orderly manner ( Flemish bond) with thick joints.

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   Where did the Cockeysville walls come from?

   • The first phase of the walls was constructed under the direction of William Dougherty. Its white Cockeysville marble exterior came from the Texas quarry now adjacent to and east of north I-83 near the Warren Road exit in Cockeysville, Maryland.

   Washington Monument - Wikipedia

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