I'm trying to remember a hardback (annual-sized) book I had back in the early 1980s.
It was all about unexplained occurrences from around the world such as the Loch Ness Monster, Spontaneous Combustion and the like.
I'm pretty sure the front cover had Tutankhamun on it. The spine had the publisher logo which may have been a octopus.
It's definitely not the Arthur C Clarke book with the skull on the cover