Another Brick in the Wall

Pope Benedict XVI celebrated the Church's World Day of Migrants and Refugees this week. During a press conference after the event, Cardinal Retano Martino said that the building of a fence along the U.S./Mexico border was part of an "inhuman program."

Asked if the U.S.-Mexican fence was the wrong thing to do, Martino said: "Yes, that's exactly what it is."

OK, kids! It's time for a pop quiz!

WHAT IS THE LEONINE WALL?

Hint #1 It forms the western and southern boundry of a famous city state.

Hint # 2 It was built by order of Pope Leo IV in the year 852 to keep out marauding Muslims.

Hint #3 This is what it looks like from outer space.

Give up? OK, one more hint...Cardinal Martino has seen it MANY TIMES!