Norway's island, Spitsbergen, holds big fossils of a giant pliosaur.
This extinct marine reptile was at least 50 feet long and weighed 45 tons, the largest known of its kind. Its massive skull was 10 feet long, and the flippers, more like outsize paddles, were also 10 feet. The creature — not yet given a scientific name but simply called the Monster or Predator X — hunted the seas 150 million years ago, in the Jurassic Period.
Here's an artist's rendition of what the creature may have looked like: