Andrew Curry at National Geographic has posted a review of sites in Syria and Iraq that have been attacked with bulldozers, explosives, sledgehammers, or is being extensively looted. The list includes:
Syria: Palmyra, Mar Elian Monastery, Apamea, Dura-Europos, and Mari
Iraq: Hatra, Nineveh, Mosul Museum and Libraries, Nimrud, Khorsabad, Mar Benham Monastery, Mosque of the Prophet Yunus, and Imam Dur Mausoleum
The article includes details about the significance of each site and its destruction along with several photos and a map.