Abstract: A fantasia aquarium, comprising a characterizing building and a plurality of see-through sealing walls, such that the aquarium provides a decorative function not only when it contains living water creatures within the water container, but also when the container contains no water creatures, allowing the aquarium to be appreciated as a piece of art-work, such that when the aquarium is empty for any reason, it can still act as a piece of decoration itself to decorate a room that conventional aquariums cannot. The fantasia aquarium also allows a viewer or a manufacturer to show off their artistic talents since the characterizing building can be decorated in many different ways, such as attaching paintings or figures onto the frame and integrally forming the decorations with the frame.