Stepping inside reveals the most exclusive feature of this sauna: a luminous, pristine Aspen interior that feels soft to the touch and remains historically bright. This interior creates a breathtaking “geode” effect as it contrasts with the dark, charred exterior, all within the vertical “soft cube” design that maximizes headroom and volume. The expansive black-tinted glass front dissolves the boundary between you and nature, while the sauna remains fully insulated for year-round US climates—offering a private, high-contrast retreat where modern design meets elemental power.

Part of the exclusive Heritage Architectural Series, the Heritage Lux Stromboli Small is a striking architectural statement designed for those who seek a bold, fortress-like sanctuary in their backyard. Named after the active volcanic island in the Mediterranean, this 4–6 person retreat features a dramatic "Shou Sugi Ban" exterior—an ancient Japanese technique of charring wood to create a deep, obsidian finish that is naturally weather-resistant and visually commanding.