This diploma thesis concerns the design and architectural expansion of the Panagiotidis Winery in Kerasia, Nea Michaniona, aiming to create a modern winery that combines production, hospitality and wine-tourism experience. The site is characterized by fertile vineyards, gentle slopes and a Mediterranean microclimate, while its proximity to the Thermaic Gulf provides ideal conditions for viticulture and easy tourist access. The existing building, small in scale and residential in character, does not meet the requirements of a contemporary, visitor-friendly winery; therefore, it is proposed to demolish it and construct a new semi-underground structure. The architectural proposal is conceived as a single underground building fully integrated into the natural terrain. The green roof acts as a natural continuation of the landscape and echoes the lines of the surrounding vineyards, offering bioclimatic advantages, natural insulation and stable conditions for wine ageing. Wooden and perforated structures filter daylight, creating high-quality spaces for hospitality and wine tasting. Through the symbolic connection of the building with the earth, the project highlights the interdependence between wine production, landscape and the region’s cultural heritage. The new underground structure achieves a balance between functionality, sustainability and aesthetics, providing a landmark wine-tourism destination that enhances the local viticultural tradition and enriches the visitor experience.