Prominent landmark in Washington, DC: Washington Monument. This 555ft obelisk stands as the centerpiece of the National Mall that honors America's first president, George Washington.

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Designed by Robert Mills, the structure was completed in two phases of construction, one private (1848-1854) and one public (1876-1884). The monument is made of marble, granite, and bluestone gneiss. This tower is both the world's tallest predominantly stone structure and the world's tallest obelisk.