What is happening underground? What do these worlds that have nourished our imaginations since the dawn of time look like? In response to our questions raised by all forms of life underground, real or dreamed, the exhibition offers a sensitive exploration of these underground worlds. By turns frightening and inspiring, they are often the mirror of our societies and the human soul. From dark depths to mythical worlds, to the teeming worlds of countercultures, the reality of the underground is multiple. These 20,000 places underground, explored by speleologists, miners or metro users, are equally fascinating to literature and cinema, from Dante to Quentin Tarantino. In a journey of more than 200 works open to the arts of all eras and civilizations, from the engravings of Gustave Doré to the poetic sculptures of Éva Jospin, the exhibition invites you on a fabulous journey, from shadow to light.