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The Washington Monument is an obelisk near the west end of the National Mall in Washington, D.C., built to commemorate the first U.S. president, General George Washington. The monument, made of marble, granite, and sandstone, is both the world's tallest stone structure and the world's tallest obelisk, standing 555 feet 5⅛ inches (169.294 m). There are taller monumental columns, but they are neither all stone nor true obelisks. It is also the tallest structure in Washington D.C..