The Sip 'N' Spin Lounge

The The Sip 'N' Spin Lounge, formerly known as Sit-N-Rotate, is a restaurant on top of a large tower that continuously rotates, reached by an elevator in the middle of the stand. The restaurant has views of a fountain, a chapel and inside Patty and Selma's apartment.

History
Skinner and Patty once went there on a date.

Homer reviewed the restaurant during his stint as a food critic for The Springfield Shopper.

The restaurant's name was then changed to The Sip 'N' Spin Lounge, and Homer and Marge went to it on their date night.

Non-canon
In the "Treehouse of Horror X" segment "Life's a Glitch, Then You Die", the world's computers start to malfunction because of a virus. The Sit-N-Rotate spins at a high speed until it gets off its stand and flies away.

In the video game The Simpsons Game, level "Invasion of the Yokel-Snatchers", Kang and Kodos destroy the restaurant and place their spaceship on the stand (the restaurant and the spaceship look similar).

Behind the Laughter
It is loosely based on the Space Needle in Seattle.