I keep having this dream of being in a place where you go down a few stone steps and there's a beach across. When the tide comes in, it's hard to go down the steps and there are usually a couple of guards that stop you. Otherwise you can go down and you'd be met with a huge expanse of water. 

I've never had a dream in which I crossed through, but always stood on top of the steps, usually around twilight or early morning. It looked so beautiful and serene. I don't know where I know this image from, but it always comes back in my mind.