The photographs in the series Terraria Gigantica: The World Under Glass, frame the world’s largest enclosed landscapes as possible impossibilities: Biosphere 2’s ocean in the Arizona desert, the Henry Doorly Zoo’s desert in the Great Plains of Nebraska, and Eden Project’s tropical rain forest in notoriously gray and cool Cornwall, England. These vivaria are enclosed environments where plants are grown amidst carefully constructed representations of the natural world to entertain visiting tourists. At the same time, however, they support scientific observation and research on the plants and animals housed under these ‘natural conditions’ that require human control of temperature, humidity, irrigation, insects, and weeds to cultivate otherwise impossible environments and species. Taken together, these architectural and engineering marvels stand as working symbols of our current and complex relationship with the non-human world.