What is pyramid on top of the Washington Monument made of?
It is unsurprising that the Washington Monument, similar to architecture all around the capital, was built with marble. What may surprise you is that the capstone resting on the top of the monument is made of a $225 pyramid of aluminum.
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The Washington Monument Looks Like an Obelisk Because of Egyptomania. In a technical sense, the Washington Monument isn't an obelisk, because it isn't made from a single piece of stone. That fact makes it no less impressive. Stretching 555 feet in the air, the Washington Monument is the tallest thing in the city.
Rather than ascend to 600 feet as Mills had intended in the original plan, Casey was persuaded to make the height of the structure ten times the width of the base, meaning the optimal height for the Washington Monument was 555 feet.
Inspections found a crack at the top of the monument, a park service spokesman said. The earthquake didn't cause widespread damages or injuries, but it did put a crack in the Washington Monument.
Facing increased criticism from black leaders and concerns that the water was polluted, Congress voted to ban swimming in the Tidal Basin in 1925. Swimming has never been allowed in the Reflecting Pool, but there were segregated, whites-only swimming pools near the Washington Monument during the late 1920s.
However, after Washington became president, he scrapped the plans for his memorial, as federal government funds were tight and he didn't want to use public money for the project.