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Mirrored Arches of Volcanic Concrete Framing Geological Exploration

Authors:
Jordan Soderberg Mills, Christopher Bradley
Mirrored Arches of Volcanic Concrete Framing Geological Exploration
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The dual flared arches of GIANT'S GATE, constructed from volcanic concrete and featuring mirrored surfaces, engage visitors with the unique geological features of the Grjótagjá and Vogagjá caves while providing a multifunctional space for exploration and education.
5 key facts about this project
01
Dual arches create a dynamic relationship between earth and sky.
02
Mirrored surfaces reflect the surrounding landscape, enhancing visual connection.
03
Constructed from local volcanic concrete, integrating with the geological context.
04
Paths and structures utilize lavacrete, linking architecture to natural topography.
05
Designed to capture sunlight at sunrise and sunset, altering color perceptions throughout the day.

GIANT'S GATE is located near the Grjótagjá and Vogagjá caves, a site where two tectonic plates drift apart. This setting informs the design, which serves as a gateway connecting visitors with the earth's core. It invites exploration of geological processes and highlights themes of emergence and transition. The architecture consists of two flared arches: one acts as a lookout tower, while the other serves as a cave entrance, creating a unique experience that reflects the natural landscape.

Geometric Configuration

The design's defining feature is the interplay between the two arches. This split creates a sense of movement and change, guiding visitors through the space. The orientation of the towers is carefully planned to make the most of natural light, enhancing the structure's connection to the changing time of day. Light filters through the arches, creating a variety of colors and shadows that shift with the seasons.

Materiality

Materials play a crucial role in GIANT'S GATE. Volcanic concrete forms the solid base of the structure, grounding it in the geological context of the site. Lavacrete is used for pathways, connecting the building to the natural environment. This choice reinforces the relationship between the architecture and its surroundings. The use of retro-reflective silica on surfaces adds another layer, enhancing visibility at night and creating a distinct atmosphere influenced by both artificial and natural light.

Functional Aspects

The design accommodates various uses, including a café, washroom, and classroom positioned within one leg of the tower. These facilities enrich the visitor experience, providing practical amenities while also serving as an educational space. Meanwhile, the other leg remains open for continuous access to the lookout, offering clear views of the surrounding landscape. This arrangement encourages visitors to appreciate the geological significance of the area.

The stepped surfaces of the arches interact with light, creating interesting reflections that resemble the textures found in the natural world. As sunlight and moonlight play across the structure, it transforms, offering a new perspective each time someone visits. The design establishes a direct connection to the landscape, capturing the essence of the geological forces at play.

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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 €
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Final registration deadline 30 October 2025

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