Trinity College Library (the 'Long Room'), Dublin. There has been a library at the College ever since it was founded (in but the Long Room was not begun until Completed in it is the largest library in Ireland, containing books.
Finally you can own a personal glass bottom boat. With the Clear Blue Hawaii Molokini Kayak it is technically not a glass bottom boat, but an entire kayak created out of clear polycarbonate with an aluminum frame. Imagine the fun of sliding along in this