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The Library of Congress in Washington DC

The Library of Congress in Washington DC is the country’s oldest federal cultural institution. Though it consists of only three buildings, it is the largest library in the world. While it is open to the public for on-site research and as a tourist attraction, only members of Congress and other government officials can check out books. The library is known as the “library of last resort” in the U.S., charged with making certain items available to other libraries if all other means have been used. The library’s holdings are vast, including more than 32 million books, more than 61 million manuscripts, six million pieces of sheet music, over one million newspapers from the last three centuries, and many more.  
Which library __________?
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