The Lujan Zoo in Argentina is one of the most alluring/dangerous attractions I have ever heard of. For $50 you can spend the day palling around with lions, tigers, bears and more.
Human-animal interactions at zoos are nothing new, but no facility has ever encouraged it as much as the Lujan Zoo. The animals at the Lujan Zoo are said to be raised around humans their whole lives, which makes them safer to play with. There is still something unsettling about seeing a little girl next to a bear though.