Is it a bird's nest, some sticks or a dinosaur den? No it's one room of a new treehouse hotel in Sweden. It's about 5m from the floor - you get in through a ladder that's dropped down.
Check out this out-of-this-world treehouse that's a spaceship! Each room is kitted out with matching furniture and sleeps either two or four people (or aliens).
Can you see this room? It's covered in mirrors and so blends in with the trees. Special film that's visible only to birds has been put up to stop them bumping into it!
This treehouse really is a room with a view. Visitors get three windows to see out into the natural pine forest in the north of Sweden.
You get into this treehouse by using a bridge on the mountain behind. We think this looks a bit like a turret of a castle but made in wood.
This treehouse is called the cabin and sits high up over a steep slope so visitors can sit back and take in the surroundings. You can almost smell the forest!!