What do I do with this wall?

Ever since I moved to my current residence, I've had a map of London on the wall behind my desk: Restoration-era, Georgian, Victorian.

I've taken the last of those down now, and the blank space is staring at me. It's a wide horizontal gap, too big to be filled by any of the pictures I have around. I don't know what to do with it.

A map of the world A Natural History of Dragons takes place in, perhaps. But I don't have such a map yet; I'm still trying to figure out the geography of that world.

What the heck do I do with this wall?