https://www.washingtontunnels.com/washington-aqueduct daily 0.75 2024-05-15 https://images.squarespace-cdn.com/content/v1/5aecb88a96d4552b00575954/1532215142941-65TJPN9Z7L0LS5EGQWD1/Washington+Wooden+Water+Pipe.png Washington Aqueduct | The D.C. Underground Atlas A wooden water pipe from Pennsylvania Avenue, installed circa 1810. Photo: Army Corps of Engineers/Public Domain https://images.squarespace-cdn.com/content/v1/5aecb88a96d4552b00575954/1531616001330-9SHU17IARAZ9G49TDSGH/DSC05942.jpg Washington Aqueduct | The D.C. Underground Atlas - Washington Aqueduct Montgomery Meigs Vault https://images.squarespace-cdn.com/content/v1/5aecb88a96d4552b00575954/1531771678302-5Z0C9J0CXXSTCQMMW4VP/Steps_in_Meigs_Vault%2C_Washington_Aqueduct.jpg Washington Aqueduct | The D.C. 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