The first one being cardboard boxes, naturally.
However, if there isn't a cardboard box to be found -- the sink is the obvious choice for hangouts. Plus, it comes with fresh, running water! Can't beat that, right?
And now so more than ever, with it being boiling outside, the feel of the cool ceramic against all that fur? Yes, please! We get it, cats of the world. We get it. And we're here to give you your spotlight, in the sink.