Braddock's Rock Originally, Braddock's Rock was a sizable outcropping of Piedmont stone jutting into the <a href="http://mallhistory.org/items/show/424">Potomac</a>. Called the "Key of all Keys," this rock became a starting point for surveyors drawing property lines for early settlers. In 1755, General Edward Braddock landed at the rocky promontory and began his march to Fort Duquesne with the young <a href="http://mallhistory.org/items/show/152">George Washington</a> among his soldiers. Later used as a quarry for the stone used in the <a href="http://mallhistory.org/items/show/66">White House</a>, <a href="http://mallhistory.org/items/show/59">Capitol</a>, and C&amp;O Canal, it was blasted away in 1832. Today, the remaining portions are 16 feet underground, enclosed by a well located among the approaches to the Theodore Roosevelt Bridge. <em>The Washington Times</em>, February 19, 1906. <a href="http://chroniclingamerica.loc.gov/lccn/sn84026749/1906-02-19/ed-1/seq-12/">View original.</a> 1755 (re-named) 1832 (destroyed) <a href="/items/browse?advanced%5B0%5D%5Belement_id%5D=38&advanced%5B0%5D%5Btype%5D=is+exactly&advanced%5B0%5D%5Bterms%5D=Pre-1800s">Pre-1800s</a> <a href="/items/browse?advanced%5B0%5D%5Belement_id%5D=38&advanced%5B0%5D%5Btype%5D=is+exactly&advanced%5B0%5D%5Bterms%5D=1830-1859">1830-1859</a>