Is it a bird? Is it a plane?

 No, it's an atomium. What's an atomium? It's a rather large model of an iron crystal lattice. 165,000,000 times large actually. It was built for Brussels' 1958 World Fair, and it's somehow still there.

You can go up it if you like. I imagine there's a good view to be had. I didn't actually go up this one though.