ISIS is leaving a path of destroyed churches, shrines and mosques in its wake as it storms across Syria and Iraq, and has even set its sights on Mecca -- Islam's holiest site. The nihilistic jihadis, led by self-proclaimed descendant of Prophet Muhammad Abu Bakr al-Baghdadi, have already bulldozed or blown up some of the most sacred places in Iraq, and seem bent on killing and destroying anyone or anything that does not measure up to their twisted vision of Islam. Experts say the group, which originally stood for Islamic State of Iraq and Syria, but now simply calls itself "Islamic...