Donald Trump vs. The Pope: Do the Vatican Walls Get the Pass?

Pontiffs behind giant stone walls should not cast stones about Donald Trump's proposed wall ... is how some people see the Pope's holy war of words with the Donald.

It's been pointed out that Vatican City -- Pope Francis' HQ -- has been surrounded by a massive protective wall for centuries. In fact, the wall was first built in 852 A.D. to fend off Muslim attackers.

It was expanded to its current size in the 1640s. The wall, in all, measures 2 miles ... surrounding 109 acres.