Smithsonian Institute.

Smithsonian Institute.

View of the Smithsonian Institute. Washington, D.C.

Post Office.

U.S. Post Office Department, Washington, D.C.

The U.S. Post Office - Washington.

General Post Office, Washington, D.C.

U.S. Post Office, Washington, D.C..

U.S. Post Office, Washington, D.C.

Post Office.

U.S. Post Office.

Post Office Department.

U.S. General Post Office, Washington, D.C., Palatial Style, modified Corinthian Order.

U.S. Post Office, Washington, D.C.

U.S Post Office, Washington, D.C.

U.S. Post Office, Washington, D.C.

U.S. Post Office.

The U.S. Post Office Department.

U.S. General Post Office Department.

Post Office Department.

Post Office Department.

Post Office Department.

Post Office Department.

The General Post Office, Department.

The U.S. General Post Office Department.

The U.S. Post Office.

The U.S. Post Office Department, Washington.

Post - Office, Washington, D.C.

General Post Office, Washington.

U.S. Post Office.