Can anyone tell me what this is?

You would not use it for potatoes, onions or any root vegetables because light makes them turn green and sprout. Too narrow to store canned goods or spices. Maybe they clipped recipe cards to the rods with clothes pins? Probably not - too close to sunlight and humidity from the sink. Certainly is weird. I cannot think of any practical reason for this.

Could it be a pot lid holder? Hard to tell the depth from here. But thats what I thought of immediately when I saw it.

Looks like a plate holder I wonder if someone thought it was just a decorative touch

I understand what you said, but the picture doesn't help me have a say what to do. Take a picture from further away, and if there's a door open it.

I can't really tell by the picture...

A place to store wooden chopping blocks?

POSSIBLY A DRYING RACK ?

Was the sink always there? It may be a spice rack. Or a dish towel rod?

Used to store those large decorative glass cutting boards ( thick glass sheets), larger hard plastic cutting boards, & pastry sheets. Thinner wooden cutting boards will tuck away in it but probably not the real butcher block cutting boards. Large serving trays will fit as well. It's design is for large fairly thin or flatter pieces. Hope this helps.

I agree that it looks like portion of a wooden drying racK. Does it fold down I front of window?

Perhaps an area for storage of baking sheets and such...