The LoC is a great old building, one of many building available to visit in their system. The LoC is a short walk from the Capitol using the new underground pedestrian tunnel, which makes aacess easy if you are coming from that direction. The exhibits are usually very nice and the architecture is amazing. The part a lot of people overlook is heading up to the top of the rotunda and looking down into the stacks themselves. You cannot just walk up and ask to look around the collection, you have to apply, take a short class and then you can get onto the main floor. The whole experience to tour the LoC is not a long one, but it is worth it.