The giant herbivious dinosaurs, the sauropods, were known until now only from the Western Hemipshere and Africa. Now Spanish paleontologists have unveiled the fossils of Turiasaurus riodevensis - not just the first European sauropod, but a colossal beast even by dinosaur standards. At 125 feet long and 40 to 48 tons, Turiasaurus is the largest animal known to have walked the continent of Europe, and one of the largest dinosaurs known.
UPDATE: Dr. Darren Naish comments, correctly, that this is not by any means the first sauropod from Europe. I relied on the LiveScience.com story saying it was without checking any other sources, so that error is my fault. Naish knows whereof he speaks: his own sauropod discovery came to light in 2004. See: http://news.bbc.co.uk/1/hi/sci/tech/4031789.stm
Naish's own blog on the sauropod dubbed "Angloposeidon" from the Isle of Wight, along with other matters paleontological and zoological, can be found here:
Side note: the LiveScience.com story has not yet been corrected, so at least I beat them to posting the correction. I sent the author an email documenting the error.