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Branching Forms and Natural Materials in a Geothermal Spa Environment

Authors:
Chun Te Lee, Chang Ting Lin, Chao Chun Kung, Pei Chi Tsai
Branching Forms and Natural Materials in a Geothermal Spa Environment
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Rising from the geothermal landscape, a fountain-shaped tower constructed with local materials serves as an observation point and spa, inviting visitors to engage with the unique thermal features of Grjótagjá Cave.
5 key facts about this project
01
A fountain-shaped tower mimics natural growth, emerging like branches from the ground.
02
Utilizes geothermal heat and water from hot springs for energy efficiency.
03
Designed to enhance visitor experience with dedicated observation and spa areas.
04
Incorporates local materials to reinforce the connection with the surrounding landscape.
05
Emphasizes sustainability by integrating traditional Icelandic heating practices.

The site at Grjótagjá Cave in northern Iceland offers a striking example of architecture that engages deeply with nature. Surrounded by geothermal hot springs, the design captures the essence of the landscape, inviting visitors to appreciate its unique beauty. The concept revolves around "White Spring," which highlights the contrast between the cold, snowy winters of Iceland and the warmth emanating from the hot springs. This relationship between the built environment and the natural world is at the heart of the design.

Conceptual Framework

The design reflects the duality of the cold landscape and the inviting warmth of the hot springs. A fountain-shaped tower rises from the ground, resembling new branches pushing through the earth. This tower is not just a visual element; it also serves a functional purpose, offering an observation point and information center for guests. This approach creates a direct connection between the architecture and its environment.

Visitor Integration

Spaces designed for visitor use play a key role in the overall layout. These include an information stand, male locker room, and a semi-outdoor spa. Each area is thoughtfully positioned to enhance the visitor experience, encouraging exploration and engagement with the geothermal features of the site. This focus on accessibility demonstrates an understanding of how people will interact with the space.

Sustainability and Materiality

The project pays respect to local traditions by using thermal steam from the hot springs for heating, combining traditional practices with modern energy conservation methods. Local materials are chosen to reinforce a sense of place, promoting sustainable architecture that resonates with the rugged landscape of Iceland.

Large windows are a notable feature of the tower, allowing plenty of natural light and offering stunning views of the surrounding area. This design choice creates an inviting atmosphere and encourages visitors to feel connected to the remarkable Icelandic environment.

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The Buildner’s Unbuilt Award 2025: Celebrating Architectural Creativity and Visionary Unbuilt Designs with a Total Prize Fund of €100,000

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The Buildner’s Unbuilt Award 2025 is an international architecture competition dedicated to recognizing and celebrating the value of unrealized architectural designs. It invites architects, designers, and students worldwide to submit visionary projects that have not yet been constructed, highlighting the power of ideas and the creativity behind the design process. By focusing on unbuilt work, the competition aims to bring forward concepts that shape the future of architecture and push the boundaries of the profession. 

Participants can compete in three categories based on project scale: Small Wonders (up to 100 m²), Medium Marvels (101–999 m²), and Large Visions (over 1,000 m²). Each category winner will receive €20,000, and additional prizes include honorable mentions, student awards, and a special Best Presentation Award. Winning projects will gain significant international exposure through Buildner’s publicity campaign and a feature article on ArchDaily, providing a unique opportunity to showcase creative ideas to a global audience. 

The Buildner’s Unbuilt Award 2025 encourages entrants to submit any type of unbuilt project, from conceptual visions to detailed designs, celebrating bold innovation without the constraints of realization. Important deadlines: registration closes on October 30, 2025; submissions are due by November 20, 2025; winners will be announced on December 17, 2025.

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Celebrating your unbuilt architecture visions with a €100,000 prize

100,000€ Prize / 2025 ideas COMPETITION
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