There was something about it that struck a chord in me that is still resonating. The tooth is from a Spinosaurus. There are a tremendous number of websites devoted to Dinosaurs. I doubt it would be possible even to attempt to list a top 50 without leaving off some excellent sites and offending their authors. There are sites by museums and universities.
Some sites are devoted to images and sculpture and some concentrate on models.
Some websites tackle certain species and some don't really do dinosaurs at all, but are devoted to other ancient reptiles such as Mosasaurs or Pterosaurs. There are several websites that are fairly encyclopediac in their approach, and they are full of links to all sorts of other paleontology on the web. These are among my favorites to visit, and remember that once you get to them, you can go anywhere. The Royal Tyrrell is a fabulous Paleontology-only museum in Alberta. Their website has a virtual tour of their exhibits.