Water reservoir, stalactite cave, and art exhibition. Come underground and experience a total sensory experience with world-class art installations. The old water reservoir is dimly lit, creating an atmosphere of fascination and enchantment for both children and adults. Each year, we invite an internationally recognized artist or architect to create an exhibition specifically for the underground space - an exhibition that stimulates all senses and harmonizes with the Cisternernes unique architecture, climate, ambiance, and history.