The Zero Milestone is a zero mile marker monument in Washington, D.C. intended as the initial milestone from which all road distances in the United States should be measured when it was built. At present, only roads in the Washington, D.C. area have distances measured from it. Location The monument stands just south of the White House at the north edge of The Ellipse, within President's Park. Atop the monument is a bronze 16-point compass rose with a very small worn-down pyramid at its center whose top serves as a National Geodetic Survey benchmark (HV1847). Coordinates: (NAD83) Altitude: 8.382 m (27.50 ft) (NAVD88) Description Designed by Washington architect Horace W. Peaslee, the monolith is about 2 feet square and about 4 feet high. It is made of precambrian Milford granite from Milford, Massachusetts, light pinkish to greenish gray, with spots of black biotite mica. The bronze disk on top of the milestone is "an adaptation from ancient portolan charts of the so-called wind roses or compass roses from the points of which extended radial lines to all parts of the then known world—the prototype of the modern mariner's compass." The monument has engravings on four surfaces: North: Zero Milestone East: Starting point of Second Transcontinental Motor Convoy over the Bankhead Highway, June 14, 1920 South: Point for the measurement of distances from Washington on highways of the United States West: Starting point of First Transcontinental Motor Convoy over the Lincoln Highway, July 7, 1919 In addition, a "brass plate placed on the ground at the north base" shown below, contains the following inscription. The U.S. Coast and Geodetic Survey determined the latitude, longitude and elevation of the Zero Milestone authorized by Act of Congress June 5, 1920 dedicated June 4, 1923 History In his plan for Washington, Pierre (Peter) Charles L'Enfant intended a column to be placed west of the Capitol, in what is now Lincoln Park, "from which all distances of places through the continent were to be calculated." Instead, in 1804, the Jefferson Stone or Jefferson Pier was placed on the meridian of the White House due west of the Capitol ( WNW of the center of the Washington Monument) to mark the Washington meridian, 77° 02' 11.56". The current Zero Milestone monument was conceived by Good Roads Movement advocate Dr. S. M. Johnson, formally proposed on June 7, 1919. He was inspired by ancient Rome's Golden Milestone