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Rainwater Harvesting Green Roof with Geothermal Energy Integration and Scenic Viewing Platform

Author:
Konrad Brzykcy
Rainwater Harvesting Green Roof with Geothermal Energy Integration and Scenic Viewing Platform
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A green roof designed for rainwater harvesting and integrated geothermal energy systems supports a viewing platform that enhances visitor engagement with the dramatic landscape near Grjótagjá caves.
5 key facts about this project
01
Green roof system captures rainwater for restroom and café use.
02
Geothermal energy is harnessed for sustainable heating.
03
Viewing platform offers unobstructed panoramic views of volcanic landscapes.
04
Pathways connect visitor amenities directly to cave entrances.
05
Local craftsmanship is showcased in information stands and art displays.

The Iceland Cave Tower is positioned between the North American Plate and the Eurasian Plate, near Grjótagjá, a group of three caves located close to Lake Mývatn in northern Iceland. This structure serves as an important stop for tourists exploring the caves, featuring a viewing tower and a platform that enhance the experience by offering wide views of the surrounding volcanic landscape. The design centers around integrating the building into the natural environment, allowing visitors to connect with the geological features of the area while enjoying a sense of calm.

Architectural Layout

The layout of the Iceland Cave Tower emphasizes accessibility and visitor comfort. Upon entering, guests encounter several key amenities, including information stands that display educational materials such as posters and flyers, along with artworks created by local craftspeople. The presence of waiting areas and a café invites visitors to relax, encouraging a leisurely pace and enhancing their engagement with the surroundings.

Functional Facilities

Alongside visitor amenities, the design incorporates essential facilities like restrooms, storage areas, and administrative spaces. This thoughtful approach meets the diverse needs of both tourists and staff, ensuring that the site operates smoothly. Connecting pathways lead from the visitor center to parking areas and the entrances to Karlagja (Men Cave) and Kvennagja (Women Cave), making it easier for guests to navigate the area.

Sustainability Measures

In a commitment to sustainability, the design features a green roof that captures and stores rainwater. This harvested water will be used in the restrooms and café, promoting efficient use of natural resources. Additionally, solar panels on the flat roofs harness renewable energy, while geothermal heat pumps tap into the local energy sources, supporting the building’s overall sustainability.

Integration with Environment

The choice of colors and architectural forms is designed to complement the natural landscape, ensuring the building fits visually into its surroundings. The viewing tower offers unobstructed sightlines, allowing visitors to appreciate the stark beauty of the Icelandic terrain. This connection with the landscape is a crucial aspect of the design, encouraging a deeper appreciation of the unique geological features nearby.

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

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Competition organisers

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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