New unit of height? The Washington Monument. Used to be Nelson's Column when I was a lad."If you imagine standing at the base of the Washington Monument, the top of the lavas would be something like 12 Washington Monuments above you."
No, a Library of Congress would be a unit of data storage, but it's expanding fairly rapidly so pinning down an exact value is difficult.I'd say Library of Congress is a unit of volume, so about 2KOSP(Olympic Swimming Pool)?
But people in the UK are still more likely to have seen photos of it, and even if you don't know how tall it is, the photos you've seen of it (or the real life views, if you've actually been there) are likely to contain familiar objects such as people to give a sense of perspective.Tricky, I doubt many people in the UK have been to Traflagar Square, so no real idea how tall Nelson's column is. I 've seen it, but still couldn't say(100')?