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. It has a parking lot with three visible parking spaces. There is one door on the main floor for entrants, and a door visible on the upper left of the building. Multiple windows can be seen on the walls of the exterior.
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.