U.S. Army soldiers tour St. Elijah's Monastery on the outskirts of Mosul, Iraq, in 2008.
The monastery stood as a place of worship for 1,400 years, including most recently for U.S. troops.
A satellite image at top shows St. Elijah's Monastery in 2011. Below it is a photo from Sept. 28, 2014, showing the site after the monastery was razed. Imagery analyst Stephen Wood, CEO of Allsource Analysis, pinpointed the destruction between August and September 2014.
Soldiers celebrate a Catholic Easter Mass at St. Elijah's Monastery on the outskirts of Mosul, Iraq in 2010.
The 27,000-square-foot stone and mortar building was missing most of its roof, but it had 26 distinctive rooms including a sanctuary and chapel.
Visitors stand at the entrance to the ruins of St. Elijah's Monastery in 2009.
"Bulldozers, heavy equipment, sledgehammers, possibly explosives turned those stone walls into this field of gray-white dust. They destroyed it completely," Stephen Wood said from his Colorado offices.
U.S. soldiers look out towards the city of Mosul, from the top of the stairwell at the monastery.
Suzanne Bott leads a tour at St. Elijah's monastery in 2009. Bott spent more than two years surveying and restoring the site as a U.S. State Department cultural adviser in Iraq.
Cracks line the walls of the ancient sanctuary in 2008.