The Petropolis Natural History Museum is a museum in Petropolis. It is the place where King Mutt and his jewel encrusted bone scepter were kept on exhibit in The Curse of King Mutt. Also featured were other exhibits including: "Deli Slicers Through History", "Sledgehammers Through History", "Fluffy Pillows Through History" and "Trash Compactors Through History".
- This museum has a resemblace to the Petropolis Art Museum.
- It is unknown if it will appear again in the series.