The Museum is an area deep in Marijuana Goddess World, and can by accessed by interacting with the red mailbox in Japan Town.
Features
There are a number of items on display including a Buddha statue and a cross. The Glasses effect can be obtained here by interacting with the glasses on the pedestal in one of the rooms.
By going down from the main area (pictured), it takes you to a portal to Flying Fish World (It used to lead to Concrete World A).
Connections
Japan Town
Flying Fish World