[sheik yerbouty]

Every picture I've ever seen of it was a large black cube. Given their mentality, I'll stick to my analogy..

[muawiyah]

There's no sense going about not really knowing what this thing is.

This is the "structure".  ~ your basic stone building which is protected from the elements by a large outer structure of teak finished over with stainless steel:

 

This is the "stone" in its stainless steel setting:

You can estimate the size of the stone from the hand to the left.

 

Islamic belief is that this is the site of Abraham's altar.  Supporting that idea is a collection of fosil timbers under or near the stone.  My informants found their time nearest this site too limited to get much of an idea what all was there.