Troops recapture town of Nimrud, 20 miles south of Mosul.
Two churches in the Southwest U.S. also made the list of 50 sites.
A new video features deaf-mute brothers who claim to be traffic wardens in militant regime
Ayatollah Ali al-Sistani calls for Sunni-Shia unity in battle against terror group.
Militants pillage 3,000-year-old pre-Islamic site a week after smashing artefacts in Mosul.