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Moss-Covered Basalt Structure Embracing Geothermal Caves

Authors:
Michael Godden, Raphael Costes, Nina Fradet
Moss-Covered Basalt Structure Embracing Geothermal Caves

Project in-detail

Constructed from local basalt, the structure's form embraces the natural landscape and integrates a central void that provides access to the geothermal caves while accommodating a café for visitor engagement.
5 key facts about this project
01
Constructed primarily from locally sourced basalt, emphasizing sustainability.
02
The design features a central void that enhances natural light and access to the caves.
03
Moss growth is integrated into the structure for a natural aging effect.
04
Intersecting staircases provide multiple levels of observation and engagement.
05
A café within the structure operates independently while connecting visitors to the site.

The Basalt Tower is located in Iceland, close to the Grjótagjá caves, which are known for their geothermal pools and unique geological features. The design aims to enhance the visitor experience while respecting the natural landscape. At the heart of the design is a central void, which creates interaction between the architecture and the environment. This approach encourages visitors to engage more deeply with the unique characteristics of the site.

Architectural Concept

The design of the Basalt Tower reaches out to the landscape where it sits. The visitor experience begins with a ramp that leads down into the earth, guiding people toward the caves in a deliberate way. This descent helps visitors feel connected to the geological features of the area. It allows a gradual transition into the site, preparing them for the beauty they will encounter as they approach the cave entrance.



Spatial Organization

The tower’s structure consists of two concave walls that frame the space while allowing visibility through the design. Inside, intersecting staircases make it easy for people to move around. These staircases create different levels of observation that enhance the experience of the surrounding landscape. Near the main void, which offers access to the rock formations, a café and technical spaces are included. This arrangement allows these facilities to serve visitors efficiently without disrupting the flow of traffic.



Materiality and Integration

Basalt rock has been selected as the primary material for construction, sourced locally to strengthen the connection to the site. By using this material, the tower not only remains sturdy but also allows for gradual change over time. The basalt can support moss growth, helping the structure blend in with its surroundings. This aspect of the design aims to honor the natural environment by allowing the tower to coexist with local geology.



Visitor Engagement

The design encourages exploration through carefully planned pathways, providing various routes to the observation points and the café. This thoughtful layout helps visitors navigate their surroundings more easily. It creates spaces for social interaction and areas for quiet reflection. One notable detail is the structure’s formwork, which includes pockets designed for moss to grow. This design choice demonstrates a commitment to harmonizing human activity with nature, allowing the architecture to change and adapt over time within its environment.

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MICROHOME 10: Celebrating Small-Scale Living with €100,000 Prize Fund and Kingspan’s Innovation

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Competition organisers

The MICROHOME 10 competition invites participants to submit visionary designs for off-grid, modular microhomes that push the limits of sustainable, small-scale living. Organised by Buildner in partnership with Kingspan and Hapi Homes, this tenth edition sets the challenge of designing a dwelling for two people within a maximum floor area of 25 m², encouraging bold solutions adaptable to any urban or rural location. The competition continues Buildner’s mission to foster innovative approaches to compact, energy-efficient housing that can address pressing global challenges.

This year’s edition offers a generous total prize fund of €100,000, including the Kingspan Award for designs that integrate high-performance Kingspan products and the Hapi Homes Award for a project selected for real-world construction. In addition to cash prizes, the winners gain international exposure through Buildner’s media partnerships, publications, and a dedicated MICROHOME magazine, further amplifying their ideas to the wider architectural community.

Key dates for MICROHOME 10 include the closing date for registration on 25 September 2025, the submission deadline on 29 October 2025 (11:59 p.m. London time), and the announcement of winners on 9 December 2025. These milestones ensure participants have clear timelines to develop and present their concepts, with early registration discounts available to support students and emerging designers worldwide.

MICROHOME

Design a new small-scale home concept in the 10th edition of MICROHOME — 100,000 € prize + construction

100,000 € Prize Fund / Kingpsan Edition #10 ideas COMPETITION
Prize 100,000 € + Potential realisation
Eligibility Open to all
Final registration deadline 25 September 2025

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