What's behind the gate?

It's what I always wonder about when I find an interesting door or gate. What is on the other side?

I don't know how I've missed this gate before. I must have passed it a thousand times. But seeing it today, it gave me a feeling of timelessness. Even the bell mounted on the wall seemed at once perfect and yet not what I would expect to see. I could almost imagine an entrance to Narnia...