It is a museum entirely dedicated to hooks.
The Hook Museum's exterior appearance is basically a green fishing chest opened up. It has a green sign that reads the museum's name in dark blue letters. It has a parking lot with three visible parking spaces. There is one brown door on the main floor for entrants, and a door visible on the upper left of the building that is blue. Multiple windows can be seen on the walls of the exterior. There are stairs leading up to the entrance, and there is a scroll on top.
The inside of the museum appears as walls covered with multiple varieties of hooks. Mr. Krabs is seen touring the museum and uses a pair of headphones to listen to audio recordings, explaining the varieties of hooks further.