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The flag of the Vatican City flies along with the U.S. flag and District of Columbia flag along Constitution Avenue outside the U.S. Capitol in Washington, D.C., Tuesday, Sept. 22, 2015.

The flag of the Vatican City flies along with the U.S. flag and District of Columbia flag along Constitution Avenue outside the U.S. Capitol in Washington, D.C., Tuesday, Sept. 22, 2015.

The flag of the Vatican City flies along with the U.S. flag and District of Columbia flag along Constitution Avenue outside the U.S. Capitol in Washington, D.C., Tuesday, Sept. 22, 2015.