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Description: The Zero Milestone is a monument located in Washington, D.C., at the intersection of 15th Street NW and Constitution Avenue. It serves as the starting point for measuring distances on the East Coast of the United States. The monument consists of a small granite pillar with a bronze plate on top. The plate marks the zero point from which all highway distances in the United States were measured until the system was redefined in the 1990s. The inscription on the plate reads "Zero Milestone, 1923, Starting Point of Second Transcontinental Road, Established by Congress, 1919." The Zero Milestone was originally intended to be the starting point for a proposed national highway system that would span the country. However, the system was never fully realized, and the Zero Milestone remains as a historic marker in the heart of Washington, D.C. Today, the Zero Milestone is a popular tourist attraction and a point of interest for visitors exploring the National Mall and nearby landmarks such as the White House and the Washington Monument.