Art Museum
The Art Museum is, as the name says, a museum with art exhibits in Bikini Bottom. It appears in the episode, Squidward's School For Grown-Ups. Squidward visits it with his new best friend, Patrick. SpongeBob comes along without Squidward and Patrick knowing, because he wants to win Patrick back as his best friend. The only employees known to be employed there are two security guards.
It also makes a brief appearance in The Masterpiece, where SpongeBob takes a large portion from one of its pillars for Squidward's statue material, causing the museum to collapse.