Muriel's has a ghost (they set a table nightly for him!), a fascinating history, and it's one of the main stops on the Haunted History tours. The food is fine, and – if it's not rented for a private event – you can bring your drinks to the dimly lit, blood-red Seance Lounge and sip them side by side with two sarcophagi.
It's also got a lovely view of Jackson Sq if you're in the mood for the less macabre, and they do a fun jazz brunch on Sundays. Not the finest food in a city where incredible is on every corner, but it's a nice spot for lunch or a tipple, especially if the latter's in the Seance Lounge.