The Library of Congress is the research library that officially serves the US Congress but which is the de facto national library of the United States. It is the oldest federal cultural institution in the United States.
Although the 23,500,000 volumes of catalogue books, and over 150,000,000 non classified items are only "lent" out to Congress and their staffers, there is plenty to see with the special exhibits and permanent collections for the rest of the citizens.
BSoleille! The bright side of planning my next trip to the Library of Congress.