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Carbon-Proofed Concrete Structure Embracing Natural Light in a Volcanic Landscape

Authors:
Michael Anselm, Marten Buns
Carbon-Proofed Concrete Structure Embracing Natural Light in a Volcanic Landscape
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The use of carbon-proofed concrete walls and vast perforated surfaces creates an atmosphere of shifting light, enhancing the visitor experience while providing educational insights in a center dedicated to the geological wonders of the Grjotagja caves.
5 key facts about this project
01
The building features a twisting form that enhances visibility from various distances.
02
Carbon-proofed concrete walls allow for significant material reduction without compromising design integrity.
03
Spiral platforms provide multi-level exhibition spaces showcasing local geological features.
04
Perforated surfaces create dynamic light patterns, mimicking effects found in natural caves.
05
Movable stone tablets facilitate interactive engagement with changing light and space.

The design focused on the Grjotagja caves is located in a dramatic landscape of volcanic formations, boiling mud, and the Blue Lake. It aims to serve as both a visitor center and an observation point. The concept is built on connecting the architecture to the natural environment, enhancing the experience for visitors while allowing them to engage meaningfully with the geological features of the area.

Form and Landscape Integration

The layout is characterized by a twisting shape that draws attention from various distances, establishing a presence within the landscape. This form complements the surrounding natural contours, creating a link between the building and the earth. It acts as a bridge, connecting crevices while highlighting the geological formations that define the area.

Functional Layout

Inside, the design focuses on practicality and visitation. There are spiral platforms that function as exhibition spaces, offering information about both local geology and cultural significance. Essential facilities, such as waiting areas, an information office, and a café, have been included to improve visitor comfort and navigation through the space. The layout is arranged to invite exploration and curiosity.

Material Usage and Sustainability

Concrete walls feature carbon proofing techniques that reduce material use by about 50%. This method results in thinner walls, which visually relate to the landscape. By placing importance on sustainability, the approach reflects an awareness of environmental issues and strives to lessen impact during construction.

Natural Light and Atmosphere

Natural light significantly influences the interior environment. Perforated surfaces allow light to filter in, creating changing patterns throughout the day. These effects resonate with the natural light found in nearby caves. Furthermore, movable stone tablets in the design enhance interaction with light. This design element leads to a lively atmosphere that encourages visitors to engage with the geological features and the space itself.

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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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Competition organisers

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.

Buildner's Unbuilt Award 2025

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

100,000€ Prize / 2025 ideas COMPETITION
Prize 100,000 €
Eligibility Open to all
Final registration deadline 30 October 2025

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