 Complete the following phrase:  In 2014 and 2015, following the rise of the Islamic State of Iraq and the Levant, several sites in Syria were destroyed by the group as part of a deliberate destruction of cultural heritage sites. In Palmyra, the group destroyed many ancient statues, the Temples of Baalshamin and Bel, many tombs including the Tower of Elahbel, and part of the Monumental Arch. The 13th-century Palmyra Castle was extensively damaged by retreating militants during the 