Thousands of feet below the surface lies a world that looks more like an alien planet than Earth. Towering glass sponges, ...

If you've ever visited the Phoenix Zoo, you might have spotted the white pyramid on a nearby hill. Here's the hidden history behind it.

To avoid too many spoilers, we've grouped these awards together. For completing the Marine campaign, you unlock 8 accolades, one of which is a silver trophy on the Playstation 3. Got a tip for this ...