When the Islamic State group seized the Syrian city of Palmyra on Wednesday, lovers of antiquities issued a collective gasp. While the primary concern is for the 50,000 residents of the desert city now joining the 50 percent of the country 's territory under ISIS' militant rule, what's left of the city's ancient architecture might be lost forever.
In the past, ISIS has shown a blatant disregard for historical artifacts, purposely destroying most it comes across. These are the UNESCO world heritage sites currently threatened by the jihadi takeover of Palmyra: