Although Rennes is not specifically known for pagan sacred sites, natural places like the Parc de la Prévalaye or the surrounding forests can be used for spiritual practices and rituals in nature. These spaces provide a suitable setting for connecting with the natural elements.

Pagan sabbats can be celebrated in groups or alone in Rennes, whether at your home, in a local circle, or in natural spaces like the surrounding forests. The rituals may include seasonal celebrations, shared meals, and meditations. It is possible to join a local group or organize your own celebrations with friends who share the same beliefs.

Celtic festivals, such as Samhain, Imbolc, Beltane, and Lughnasadh, can be celebrated in groups or individually in Rennes. These celebrations may include rituals, bonfires, and offerings to nature. Joining a local circle or organizing your own celebrations with like-minded friends is a great way to mark these times of the year connected to Celtic tradition.

Rennes has a rich history, and some places can be associated with esoteric or mystical elements, although this is not always obvious. Old buildings, such as Saint Peter's Cathedral, and other historical sites may have legends or hidden symbols that interest esotericism enthusiasts.