Grotta Giusti, a nineteenth-century former villa turned hotel, is offering floating therapy in its on-site thermal cave.

Fed from an underground hot spring lake, the 130-million-year-old cave acts as a natural steam room, and features stalactite and stalagmite formations and several underground labyrinths.

Guests begin their floating session with one of the hotel’s scuba diving instructors, all of whom are experts in breathing techniques, who teach guests how to control their breathing and use it to relax their bodies and minds.

After learning to breathe properly, guests are guided into the thermal lake. A series of stretches and flexes are carried out by the therapist as the guest floats in the mineral-rich waters. The water temperature is close to body temperature, resulting in the feeling of floating in an anti-gravity chamber.

Divided into three distinct areas called Heaven, Purgatory and Hell, the cave’s temperatures range from 28 to 34 degrees C (82-93F). Large vaults in the rocks offer areas to sit and enjoy the steam. The bottom of the cave, where temperatures always remain at 36C (96.8F), is known as The Limbo.

Grotta Giusti offers 64 bedrooms with thermal water on tap in many of the hotel’s bathrooms, as well as in its outdoor swimming pools.