How do I hang decorative maps on metal piping?

Is this what you are looking for???https://www.hometalk.com/diy/decorate/walls/diy-map-art-from-old-pallets-16476573

DIY Map Art From Old Pallets

Are they paper or fabric.

You can try using shower curtain rings. Or hang the maps with binder clips and wire them to the pipes.

Hi Michelle. I'm Cindy. If you put a frame on the maps, you could drill holes in the frame and use S hooks to hang them.

I would definitely frame the maps and use hooks to hang them. You can probably find frames with hooks for this project at your local hardware store or on Amazon.