Housing many of the Nation's most unique and priceless pieces of history, the U.S. Library of Congress is a library unlike any other. In this fascinating look at the more than two-century-old institution - the largest library in the world - MODERN MARVELS takes a rare, behind-the-scenes tour of the Library's vast collections. Here, upward of 745 miles of shelves hold close to 145 million items, many of them invaluable treasures - from George Washington's hand-written diaries and personal copy of the Constitution to historic drafts of the Declaration of Independence to Galileo's first images of the moon. See how a staff of approximately 4,000 people catalog, safeguard, and preserve these prized possessions and how modern technology has enabled them to distribute these items globally through award-winning website and a new World Digital Library. Featuring rarely seen footage of the Library's vaults and incisive expert interviews, THE REAL NATIONAL TREASURE is a must-see for any history fan.