Here is the cat tree we have out in the dining room. Jax loves to lay on the top especially when the window is open.
(Oh my, Jax is so tiny!)
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We also have a smaller basic one in the "cat room" that I don't have a picture of on here. It just has the round tunnel thing (that they never really use) with a scratching post (that Paizly loves) holding up a platform at the top. That one is also in the window so they can sit and look out.