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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 Next House: USA — A Global Call to Reimagine the American Suburb

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Buildner is launching The Next House: USA, a global architecture competition that challenges architects, designers, and thinkers to reimagine the American suburban home for the 21st century. For decades, the suburban house has symbolized comfort and stability, but today it often reflects excess, isolation, and environmental strain. This competition asks: how can the American home evolve to address climate urgency, economic pressures, and shifting social values?

Participants are tasked with designing a prototype home of no more than 1,500 sq ft (≈140 m²) for a household of two adults and one child. The design should be compact yet generous, adaptable, sustainable, affordable, and replicable across diverse U.S. contexts. More than a design exercise, the competition aims to spark a conversation about how homes can support healthier, smarter, and more connected communities.

The total prize fund is $20,000 USD. The final registration deadline is May 20, 2026, and winners will be announced on September 22, 2026. The Next House: USA invites architects, students, and visionaries worldwide to redefine what the American home means today—and what it should mean tomorrow.

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