Educational Exhibit at the Washington Monument in Washington DC // WASHINGTON, D.C., District of Columbia — An educational exhibit at the observation level of the Washington Monument displays a cross-sectional model of the obelisk's pyramidion alongside interpretive panels. Designed by architect Robert Mills, the 555-foot unreinforced masonry structure was completed in two distinct phases, resulting in a visible color change in its marble facade at the 150-foot mark. The displays detail the complex structural engineering required to support the massive stone weight, highlighting the 73-degree

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