It is mainly made of marble and only has one door. Also, it has a short amount of stairs unlike most museums. Its exterior structure looks similar to the Metropolitan Museum of Art in New York City, New York, except it is much smaller.
It has many paintings and sculptures done by many famous fish. The wall is simple but the floor is shiny, as Patrick described that it "compliments" the artwork. The ceiling of the Art Museum also appears to be tiled.
Role in series
SpongeBob takes a large portion from one of its pillars for Squidward's statue material, which causes the building to collapse.