Sauroposeidon
The press release in 1999 immediately garnered international media attention, which led to many (inaccurate) news reports of "the largest dinosaur ever!". While "Sauroposeidon" likely represents the tallest known dinosaur taxon, it does not hold records for either the longest or most massive. "Patagotitan" or "Argentinosaurus" make better candidates for the title "World's Largest Dinosaur" (presuming to ignore, as is conventional, "Amphicoelias"), though incomplete fossil evidence makes exact rankings impossible.
Shanghai Natural History Museum
The largest exhibit is a 140-million-year-old dinosaur skeleton of "Mamenchisaurus hochuanensis" from Sichuan Province, which is over four stories high. The museum also has two mummies and several human embryos.