Stone

Photo Credit: nps.gov

Bridge At Antietam Closed After Wall Falls

The National Park Service says part of a stone wall of the Burnside Bridge at Antietam National Battlefield has fallen into Antietam Creek.

01/17/2014

(Credit: Saul Loeb/AFP/Getty Images)

Researcher: Slaves Quarried Stone For Smithsonian

New research has found that the red sandstone for one of the oldest buildings on the National Mall, the Smithsonian Castle, was quarried by slaves.

12/13/2012