The Megalosaurus has a special distinction among dinosaurs as it was the first ever species of dinosaur to be scientifically named and identified. Megalosaurus meant simply 'great lizard' and it was the mould from which all dinosaur related theories and ideas arrived. It was also the first dinosaur to be featured in popular fictional media, in the Charles Dickens novel Bleak House there is an opening scene that begins with a description of Megalosaurus. The first reconstruction of the Megalosaurus was inacurrate, making it resemble a large predatory lizard that moved on four legs even though now we know it was a bipedal active predator, not a sluggish scavanger (in fact the discovery of this fact was one of the things that would later give rise to the idea of dinosaurs being much more energetic). The incorrect construction of the Megalosaurus however made it into many scientific text books and even made into large display models in the Crystal Palace Gardens. The Crystal Palace itself however burned down but the garden and models remained and to this day exist as a testament to how far Evolutionary Biology has come and indeed our understanding of the world today.
... There, that's my fact.