A secret chamber has been discovered in the Smithsonian
A 30-foot-deep chamber was recently uncovered under the National Mall in Washington, D.C. Construction crews found the cistern as part of an effort to revitalize part of the historic building.
A 30-foot-deep chamber was recently uncovered under the National Mall in Washington, D.C. Construction crews found the cistern as part of an effort to revitalize part of the historic building.