Get inspired!

17,725 architecture projects

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

Sand-Cast Concrete Observatory with Spiral Staircase Overlooking Diverse Landscapes

Authors:
Fred Leung, Kan Tong
Sand-Cast Concrete Observatory with Spiral Staircase Overlooking Diverse Landscapes
Explore the full project presentation!
Subscribers only
The sand-cast concrete observatory, defined by a spiral staircase and elevated views of North Vidzeme's varied landscapes, serves as a hub for exploration and community gathering.
5 key facts about this project
01
The observatory stands 31.7 meters tall, offering expansive views of the surrounding landscape.
02
A spiral staircase provides unique vertical circulation and direct access to gathering spaces.
03
Sand-cast concrete construction reinforces the tactile connection between the building and its environment.
04
The design emphasizes fluid integration with the existing terrain and ecological context.
05
A peripheral veranda enhances the transition between public and private areas for social interactions.

Set in the diverse landscapes of North Vidzeme, Latvia, the design integrates a trail and an observatory, inviting exploration and interaction with nature. The main idea focuses on a journey through different environments, allowing visitors to connect with the land and enjoy their surroundings. The project encourages sensory experiences as people walk through the various ecological zones.

The Trail

The trail is a central feature that leads individuals through contrasting ground textures and ecosystems, including farmland, forests, plains, and swamps. As visitors meander along the pathway, they experience a sense of adventure and discovery. Each step offers a new view and a different feel of the land, enhancing engagement with the natural world.

Kurgi Observatory

The observatory functions as both a lookout point and a space for curiosity. It rises to 31.7 meters, designed to enhance the visitor experience with its dynamic circulation and varied floor textures. The height of the structure provides expansive views of the surrounding terrain. As visitors ascend, the upper levels offer a compressed panorama, creating a unique relationship between the built environment and the wide-open landscape.

Gathering Spaces

In addition to the observatory, gathering spaces play a vital role in encouraging social interaction. One such space is a gathering hut, accessed by a spiral staircase. This area is covered and offers comfort for groups to meet. The adjacent peripheral veranda serves as a transition zone, balancing public engagement with the need for quiet moments of reflection.

Materiality and Structure

Materials used in the design include sand-cast prefabricated concrete for the floors and ceilings, ensuring strength and a connection to the natural environment. The lightweight skeletal structure allows the observatory to blend into the landscape. The ceiling features suspended sand-mixed plaster that highlights natural shapes, reinforcing the bond between architecture and its setting.

Overall, the careful arrangement of space, structure, and nature creates an environment that fosters a deeper appreciation of the surroundings, allowing for meaningful experiences and connections as people explore the landscape.

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

Enter an open architecture
competition now

The Home of 
Shadows
The Home of Shadows
The light studies. Edition #4
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 Architect’s 
Stair
The Architect’s Stair
Take a step and make a statement! Edition #3
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

new
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
Early bird registration deadline 5 November 2025
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 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
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