I love cast iron too. We were looking for a cast iron bench for a while. I pretty much gave up. All we found was a mini one for kids (or dogs!). They are all lightweight and flimsy looking now. My dad has one in his backyard. It's been there for over 30 years and it's still perfect, except maybe needs new paint.
I would LOVE something like this
Pin by Priscilla Chan on Patios & Rooftop Decks | Pinterest