Wow - were there any other people there specifically for the anniversary of his passing?

Not a soul in sight. The memorial is in rough shape. I'm from the area and am seriosuly considering looking into what I would have to do to help upkeep the memorial.

That whole building is the mausoleum for Garfield?

Yep! It's a beautiful building, but again, not very well kept. But I believe it is the only Presidential coffin where there is pretty much public access.