Sounds like the Atlas statue to me. Once the globe from the statue falls through the floor rotate the crank again and move across the walkway to the other side. You should now be able to head up the ramp to get some shotgun ammo and the Key of Atlas. Head back down the ramp and to the left you should see the globe damaged the pillar somewhat, letting you climb up. Jump and grab the side of the walkway here to get a small medipack.