The new home to Tarbosaurus bataar, a close cousin of the larger Tyrannosaurus Rex, and a couple dozen other complete dinosaur fossils. The complete fossil was stolen from Mongolia by an American archeologist, Eric Prokopi, and auctioned off in New York for $1 million. News of the auction quickly set off an international criminal case that resulted in the arrest of Prokopi, and the return of dozens of dinosaur fossils to Mongolia by the US government. Mongolia then decided to convert the old Lenin Museum into a place to display its greatly expanded collection of dinosaur fossils, all of which were found in the Gobi Desert. The museum opened its door in July 2014.