On Dec. 6, 1884 — 36 years after construction had begun — the 3,300-pound aluminum capstone was placed atop the obelisk, making the Washington Monument, at 555 feet, the world’s tallest ...
DayTripper on MSN1y
How to Tour the Washington Monument in DCThe Washington Monument is one of the most iconic landmarks ... The exterior is marble and granite, the capstone aluminum.
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