Codex Serphinianius is certainly the weirdest encyclopedia you can find on Planet Earth today. Originally published in 1981, Codex Seraphinianus is an illustrated encyclopedia of an imaginary world, created by the Italian artist, architect, and industrial designer Luigi Serafini during thirty months, from 1976 to 1978. The book is written in a cipher alphabet in an imaginary language and is so damned strange that it has accumulated a veritable industry of speculation about its meaning, deeper origins, and whether the language in which it is written actually has any syntax or not.
In 2013 the codex was, for the first time in more than thirty years, resurrected in a lavish new edition by Rizolly and is available for purchase on Amazon.
(FIY: according to Ufonaut Benyo, the submitter of this post, the above image depicts himself as he is heading home to our native Planet Anchor from a neighboring planet in the Sombrero Galaxy. He is not so sure about the snapshots included below.)