Got a reputable source for that particular outrageous assertion? Now, if you had said they have one third of the extant works of Italian Renaissance painters and sculptors, I might believe you.
Bill Gates could buy and sell the Vatican a couple of times over. And, on a per-capita basis, the Catholic church's wealth pales in comparison to that of the Mormons.
Sure. Enjoy. A long read, but what itemized account of 2,000 years of coercion isn't, huh?
http://www.bibliotecapleyades.net/vatican/vatican_billions.htm
Anticipating apologistic outrage with this source, please know that this is but one of literlly hundreds of such documentations of the Vatican's pecuniary pursuits. As Scripture tells us so vividly, "Where your treasure is, there will your heart be also..."
;-)