Autodesk Revit Architecture

[#1]

I am having trouble placing a wall foundation under a curtain wall in my project. Revit says that a foundation has been added but it is not visible in any view. I've tried editing the visiblity properties but that didn't fix the probelm. Thanks for the help.

[#2]

Is it not even visible in a 3d view?

[#3]

No, it doesn't even show up in the 3D view. The members are listed in the structural schedule, but they are not visible in any view.