Do you mean a mental state or a physical place?

Mine is fucking sweet. It is a large forest of pine trees with a small (10 meter diameter-ish) pond in the center. The pond is super deep, so there seems to be no bottom and is crystal clear. At the pond there is a break in the trees so I can see the stars. Occasionally the pond will be at the edge of the forest and I'll see a sunrise. I never actually see the sun only the colors it has. I usually sit on top of the water in the middle of the pond; I never fall down nor get wet although I can feel the water pressing against me if I lay down or choose to stick my hand in it. It is just cold enough to be lovely with the occasional light snowfall making the ground around the pond covered with snow and the pines with white frost on them. Even when it snows, there are no clouds, except the occasional beauty and when the sunset appears as the light looks great on the clouds.

It's a pretty chill place. I've never seen anything else there unless I wanted there to be like me imagining something there. There is usually wind in the trees causing it to make a nice little sound and make it feel even colder, but in a good way.

Anyone else have a place like this?

I don't have a specific place really. I just free float through all forms of thought, collecting all of them.
Sometimes I'll return to find I was ranting about a certain subject.
Sometimes I'll return to find that I had been acting out a scene in one of the many stories I've never written, movement and all.

@dr_richard_ew A mental place that you just retreat to in a day-dream like state.

Ah, I see. Well, I wish I had a place like that, but unfortunately I don't, so I'm kinda stuck with reality

You need to find one. They're extraordinary useful.

You mean the "nothing box" where literally nothing is thought about? Data can enter our eyes and ears but nothing gets processed or recorded?