Library of Congress, Thomas Jefferson Building

The world's largest library, whose 1897 Jefferson Building is a Gilded Age showpiece of marble, mosaics, and the breathtaking domed Main Reading Room. Go to see the ornate Great Hall and rotating treasures like a Gutenberg Bible. Free timed-entry tickets are required; the building is open Tuesday through Saturday, 10 a.m. to 5 p.m., with extended Thursday hours.

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Address: 10 First St SE, Washington, DC 20540Opens in Google Maps
Website: Visit site

Image: Thomas Jefferson Building — via Wikimedia