I used to visit the Library of Congress on my many trips to Washington, DC. The first time I visited I wasn’t expect to see this amazing entrance to the library. You can take tours also and I would recommend them. This is a huge, huge, huge library! Did I mention it is huge! I spent time in the genealogy section and if there were books that your were looking for that wasn’t in the section, you filled out a small form and gave it to a library there and they would have it located and it would be delivered to the section by a small tram system. An amazing experience!