Get inspired!

17,725 architecture projects

Learn from past Buildner architecture competition participants through our extensive project library, curated over more than 15 years!

Corten Steel Observation Tower with Earth Integration in Icelandic Landscape

Authors:
Joren Jans, Ward Alblas, Max De Veth
Corten Steel Observation Tower with Earth Integration in Icelandic Landscape
Explore the full project presentation!
Subscribers only
Set against the rugged landscape of Iceland, the observation tower utilizes corten steel and rammed earth to create a structure that integrates seamlessly with its environment while offering visitors expansive views of the surrounding geological features.
5 key facts about this project
01
Rammed earth construction enhances sustainability and thermal mass.
02
Corten steel exterior provides weathering resistance and visual contrast.
03
The tower's routing gradually reveals expansive landscape views.
04
Multiple viewing platforms highlight unique geological landmarks.
05
Natural light filtered through perforations creates dynamic interior shadows.

The Grjótagjá Cave Tower sits near the Grjótagjá caves in Iceland, an area known for its remarkable natural baths. The design focuses on connecting visitors with the landscape, inviting exploration and appreciation of the surroundings. By blending into its environment, the structure serves both as a functional observation point and a visual marker that reflects the area's geological character.

Architectural Concept

The tower's design centers on the relationship between natural elements, particularly water, earth, and rocks. It is placed carefully within the landscape to enhance its surroundings. This approach encourages visitors to engage with the natural setting while establishing an architectural feature that prompts discovery and understanding.

Visitor Experience

As individuals ascend the tower, they follow a thoughtfully designed path that builds anticipation. The structure initially obscures views, creating a sense of mystery and curiosity. Gradually, the landscape unveils itself at different heights, culminating in an expansive view of Iceland's dramatic scenery at the top.

Light and Spatial Organization

Natural light plays an important role in the design. An opening at the top allows sunlight to filter in, mimicking the soft illumination found in caves. This feature enriches the experience, as light brightens the interior and creates shifting shadows throughout the space. The interplay of light and structure brings a dynamic quality to the tower.

Materiality

Rammed earth serves as the main material for the tower, demonstrating an eco-friendly approach to construction. Corten steel complements the earth and provides a contrasting texture that enhances the overall design. This choice ensures durability and blends the building with its rugged environment while supporting sustainable practices.

The tower features several viewing platforms that frame significant geological sites, including Hverfjall Volcano and Mývatn Lake. These elements encourage visitors to connect with the landscape and immerse themselves in the natural beauty surrounding them.

Noticed a mistake?
Highlight the text and click on
Noticed a mistake

Enter an open architecture
competition now

The Next House: USA
The Next House: USA
20,000 USD Prize
The Architect's 
Chair
The Architect's Chair
Take a seat and make a statement! Edition #5
Kinderspace
Kinderspace
Architecture for Children’s Development #3
The Home of 
Shadows
The Home of Shadows
The light studies. Edition #4
The Architect’s 
Stair
The Architect’s Stair
Take a step and make a statement! Edition #3
MICROHOME 2026
MICROHOME 2026
100,000 € Prize Fund / Kingpsan Edition #11
Buildner's Unbuilt Award 2026
Buildner's Unbuilt Award 2026
100,000€ Prize / 2026

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

`
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.

The Next House: USA

Design the next suburban home for the USA

20,000 USD Prize ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 19 November 2025

Open architecture competitions

  • Closest deadline first
  • Project competitions first
    Selected winning projects have the potential to be constructed
  • Ideas competitions
    Experimental competitions with the focus on pushing the boundaries of creativity
new
The Next House: USA

Design the next suburban home for the USA

20,000 USD Prize ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 19 November 2025
new
Iceland 
Slow Sauna

Design slow sauna in Iceland

project COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 26 November 2025
Concrete 
Pavilion

Design a concrete pavilion

Edition #3 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Final registration deadline 27 November 2025
new
Pavilion Atlas 2026

Design a story of your country

ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 21 January 2026

Recurring architecture competitions

The Last 
Nuclear Bomb Memorial

Design a memorial that speaks to the cause of ending all nuclear weapons programs

Edition #6 ideas COMPETITION SILENT CONTEST For this competition, NO DESCRIPTION TEXT is allowed. The architecture ideas must be communicated strictly with visuals.
Prize Monetary award
Eligibility Open to all
Final registration deadline 13 November 2025
new
The Architect's 
Chair

Take a seat and make a statement!

Take a seat and make a statement! Edition #5 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 20 November 2025
Hospice - 
Home for the 
Terminally ill

Design a safe and supportive space to those struggling with a terminal illness

Edition #5 ideas COMPETITION
Prize 10,000 €
Eligibility Open to all
Final registration deadline 26 November 2025
Kinderspace

Design a kindergarten of tomorrow

Architecture for Children’s Development #3 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Final registration deadline 26 November 2025
Museum of 
Emotions

Use architecture to create different emotional states

Edition #7 ideas COMPETITION SILENT CONTEST For this competition, NO DESCRIPTION TEXT is allowed. The architecture ideas must be communicated strictly with visuals.
Prize Monetary award
Eligibility Open to all
Final registration deadline 27 November 2025
Re:Form - 
New Life 
for Old Spaces

Choose a site—used, abandoned, or forgotten—anywhere in the world, and give it a new purpose

Edition #2 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Advance registration deadline 3 December 2025
The Home of 
Shadows

Design a home with no artificial lighting

The light studies. Edition #4 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Advance registration deadline 14 January 2026
The Architect’s 
Stair

Take a step and make a statement!

Take a step and make a statement! Edition #3 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Advance registration deadline 15 January 2026
new
MICROHOME 2026

Design a new concept of small-scale home and share a prize fund of 100,000€

100,000 € Prize Fund / Kingpsan Edition #11 ideas COMPETITION
Prize 100,000 €
Eligibility Open to all
Early bird registration deadline 11 February 2026
new
Buildner's Unbuilt Award 2026

Celebrating your unbuilt architecture visions with a €100,000 prize

100,000€ Prize / 2026 ideas COMPETITION
Prize 100,000 €
Eligibility Open to all
Early bird registration deadline 26 February 2026

Media, partners and clients

To view this project in detail,
please log in with your
Architects’ Network Plus account.
Subscription instantly unlocks all the architecture projects plus other member-only benefits:
  • Access the 17,725 Concept Library
  • Professional tools including file transfer, email, portfolio management, and more
Register now
Already a member? Log in

This website uses cookies to improve user experience and gather usage statistics.

More information is available in our Privacy & Cookie policy