Learn more about ISIS, the Islamic militant group that's taken over parts of Iraq and is advancing toward Baghdad.
With its multi-pronged assault across central and northern Iraq in recent weeks, the Islamic State in Iraq and Syria (ISIS) has usurped Al-Qaeda as the most powerful and effective extreme jihadist group in the world.
The National Park Service turned 98 years old on Monday. Learn more about some of America's top national parks here.
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