On a wooded headland above Bostalsee near Gonnesweiler, Seezeitlodge Hotel & Spa follows the curve of the lake with a low, sun-oriented building of glass and charred larch. Rooms use pale timber, natural fabrics and subtle Celtic motifs, opening towards water or forest. The spa includes an indoor-outdoor infinity pool, a Celtic sauna village and a natural swimming pond, alongside massage and yoga spaces. Lumi restaurant and Bar Nox anchor the public rooms, with terraces extending towards the shoreline. Slatted facades filter light across the interiors, while the lake remains visible through the building's broad glazed elevations.