The Citadel aims at being an extensive archive of information for George R.R. Martin's A Song of Ice and Fire. From a collection of house heraldry to an exhaustive compilation of thematic details in the Concordance, the main goal is to provide factual information.
The site also includes a compilation of the prophecies encountered in the books, complete with our proposed interpretations, as well as reviews of books (both ASoIaF -- and the spoiler-free review of A Game of Thrones provides a great introduction to the series -- and non-ASoIaF).
Those new to the books should be aware that the site does not separate out information that might contain spoilers, so if you have not read all the books and stories set in Westeros, keep in mind that you may find yourself encountering spoilers in any of the sections of the Citadel. If you have any questions and/or comments about this site, please don't hesitate to contact us at webmaster@westeros.org.