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Exploring Subterranean Spaces Through Dark Concrete and Volcanic Formations

Authors:
Bertille Bouchard, Estelle Didier, Charlotte Malgoyre
Exploring Subterranean Spaces Through Dark Concrete and Volcanic Formations
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Constructed from dark concrete and volcanic materials, the design elegantly integrates with Iceland's geological landscape while serving as a gateway for exploration and education around its subterranean caves.
5 key facts about this project
01
The project is located on a fault line between the American and European tectonic plates.
02
It features a central tower designed as a gateway to the caves below.
03
The architecture utilizes dark textured concrete made with volcanic ashes.
04
Interior spaces evoke the sensory experience of natural caves.
05
Paths guide visitors through varied geological landscapes, enhancing exploration.

The design draws inspiration from the concept of a passage to the center of the Earth, a theme found in the writings of Jules Verne. Set in Iceland, the project is located on a fault line between the American and European tectonic plates, utilizing the distinct geological features of the area. The structure serves to educate and engage visitors, inviting them to explore the geological history of the landscape.

Gateway Structure

At the center of the design is a tower that functions as a gateway to the caves below. Its shape is thoughtfully crafted to enhance the visitor experience, encouraging exploration through varying effects of light and shadow. The tower’s presence is intended to blend with the nearby Hverfjall volcano, allowing it to stand out while also connecting with the natural surroundings.

Interconnected Spaces

The layout includes a series of interconnected spaces that create a winding experience for those who enter. This fragmentation allows for different activities and encourages visitors to discover the diverse geological features of the site. Paths guide individuals through dramatic landscapes, including unique volcanic formations and native flora, linking the architectural journey with the rich geological narrative of the region.

Sensory Experience

Interior spaces are designed to invoke the feeling of being in a cave, ensuring an immersive experience. Carefully placed openings provide views of the outdoors, with walls arranged to create intriguing patterns of light and shadow. This design choice enhances the atmosphere, fostering a strong connection between visitors and the natural environment.

Geological Education

An educational aspect is central to the design through an exhibition hall that focuses on the geological characteristics of the fault line. This element adds depth to the visitor experience, offering insights into Earth’s processes while reinforcing the relationship between the architecture and its geological context.

Dark textured concrete made with volcanic ashes is used to blend the structure with the environment. This material choice reflects the unique geological heritage of the site while contributing to an overall visual narrative. The careful interplay of form and materiality brings attention to the Icelandic landscape, enhancing the architectural experience.

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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.

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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