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Basalt Stone and Exposed Concrete Visitor Center Embracing Geological Formations

Author:
Frederik Cuyvers
Basalt Stone and Exposed Concrete Visitor Center Embracing Geological Formations
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Emerging from the Icelandic landscape, the visitor center utilizes reinforced concrete and basalt stone to reflect the geological features of its surroundings while providing direct access to the nearby lava cave.
5 key facts about this project
01
The building is primarily located underground to minimize visual disruption.
02
Basalt stone is used extensively for the courtyard and stairways.
03
The structure's form resembles a butterfly, reflecting its geological inspiration.
04
Reinforced exposed concrete features vertical planks that echo local geological formations.
05
Cross-laminated timber contributes to the interior warmth and structural integrity.

The Butterfly Cave Tower is located in Iceland, near a lava cave, and serves as a visitor center that connects people with the natural landscape. Its design draws inspiration from geological features, specifically the fissures created by tectonic plate movements. The building is primarily underground, featuring sloping roofs that rise from the ground. This arrangement helps to preserve the scenic view while providing a unique experience for those who visit.

Design and Layout

The visitor center includes two main entrances positioned on the north and south sides. The entrance located on the north houses an information stand, which is integrated into the exposed concrete wall and assists visitors in navigating the space. The layout facilitates movement toward the lava cave, allowing guests to easily explore the natural features of the area.



Spatial Organization

At the core of the structure is a central courtyard that connects various public areas, including a ticketing section, a café, and a multipurpose room. This configuration encourages accessibility, particularly with the elevator placed close to the ticket area, which simplifies circulation for all visitors. Essential service areas, such as restrooms and additional seating, are kept separate from the main pathways, promoting an efficient flow of foot traffic.



Materiality and Construction

Reinforced exposed concrete is the primary material for the building's exterior. Its textured surface resembles natural geological formations, helping the structure merge with its surroundings. The groundwork includes basalt natural stone, featured prominently in the courtyard and stairways, enhancing the overall connection to the local environment. The roof is equipped with stainless steel panels, which provide durability and improve energy efficiency.



Interior Experience

Inside, a ribbed timber structure made of cross-laminated timber supports the building, resulting in a warm aesthetic that contrasts with the concrete exterior. Spruce plywood is used for cabinets and lockers, maintaining functional coherence throughout the space. The flooring, finished with basalt stone, ties the interior back to the natural elements outside. The design effectively promotes a relationship between the building and its landscape, inviting visitors to engage thoughtfully with both architecture and nature.

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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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100,000€ Prize / 2025 ideas COMPETITION
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