The Royal Danish Library. Copenhagen, Denmark. via flavorwire.com
The Boston Public Library is the first publicly supported library in the US. It was established in 1848 and has since grown to its present collection size of 22 million items, which makes it the second largest library in the United States. The Central Library consists of two buildings, the Johnson Building and the McKim Building. The McKim building houses the library’s research collection and exhibitions and was built in 1895. The research collection at McKim is made up of over 1.7 million rareties, including many medieval manuscripts, incunabula, early Shakespeare that includes a First Folio, colonial Boston records, a major Daniel Defoe collection, and the libraries of many famous men of history including John Adams, William Lloyd Garrison, and Nathaniel Bowditch.
The Library of Congress is essentially the national library of the US and the oldest federal cultural institution. It consists of three buildings and is the largest library in the world as measured by shelf space and number of volumes. The holdings of the library are impressive and varied, and include over 32 million books, more than 61 million manuscripts, a rough draft of the Declaration of Independence, and a perfect vellum copy of the Gutenberg Bible (one of only four in the world)....