Conceptual drawing of an underground museum with modern design features.

PAX Architects Design Underground Museum for Nicolai Astrup

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Written by Seth Sebastian

2026-06-10

In the serene landscape of Sunnfjord, Norway, where the rugged hillside gently meets the water, PAX Architects has envisioned an innovative museum that appears to descend into the earth. This unique proposal, called The Cave, maps out a 1,500-square-meter visitor center for Astruptunet, the famed former home and artistic hub of painter Nicolai Astrup. The Danish studio’s design emerged as a finalist among 164 entries in a spirited competition.

The museum’s architecture integrates seamlessly into the existing terrain, creating the illusion of a concealed treasure below the surface. From Astruptunet, the structure seems to vanish, hidden by natural elements. From nearby roads and villages, it exists only as a subtle fissure in the landscape—glass and stone hinting at a deeper world beneath.

Inspired by Astrup’s Vision

PAX Architects drew inspiration from Nicolai Astrup’s evocative painting, “The Cave,” using the idea of a carved-out landscape as their guiding principle. Upon entering through a modest gap in the earth, visitors encounter interiors that echo the natural world outside. The museum maintains Astruptunet as the primary cultural beacon, with the new space serving as a subterranean extension, mirroring Astrup’s creative universe.

The visitor center is thoughtfully designed around a central foyer accessible via two entries. Exhibition areas and a café flank this space, ensuring flexibility—gallery areas can be secured while the café remains open for community events. As guests explore, they experience a gradual change in floor height, ceiling clearance, and scenic vistas. Accessibility has been smoothly integrated with the inclusion of ramps and elevators.

Architectural model showing underground museum layout with natural surroundings.

Landscape As Art

Inside, sweeping horizontal windows frame the dramatic fjord landscape, integrating Astrup’s paintings directly with their inspirational setting. As you move through the galleries, nature and art converse seamlessly, enhancing the narratives each painting tells. The exhibition areas are dim and cocoon-like, punctuated by narrow openings that allow slivers of sunlight—flexible spaces designed to adapt to varied curation styles.

Strategically placed niches craft moments of reflection, offering views that tie artworks to the living scenery beyond.

Interior view of the PAX cave museum with rock-like walls.
PAX cave museum

Materials Reflecting Nature

The building design honors its environment by extensively using local materials. Stone shapes the paths, walls, and flooring, with excavated rocks finding new life within the construction. Concrete walls mixed with these stones, tactile clay plasters, and textured metal ceilings create an enveloping auditory and visual experience.

For a look at how materials can transform spaces, see what Atelier L created in Beijing with a reflective pavilion from a simple coffee dripper.

As a passive house, the museum optimizes environmental harmony through insulation, triple-glazed windows, geothermal systems, and heat recovery solutions. A vegetated roof blends seamlessly into the landscape, storing rainwater and enhancing the visual dissolve into the slope. Controlled internal lighting protects the precious artworks.

Entrance of PAX cave museum with a natural rock facade.
PAX cave museum

Pathways Through Culture

Around The Cave, PAX Architects have envisioned minimalist pathways that harmonize with the landscape while connecting key points like the bus stop, entrances, and café terrace. Designed with local stones and vegetation, these trails invite visitors to pause and absorb the panoramic views before heading inside to the galleries.

This proposal embodies a broader movement in museum architecture—cultural structures that prioritize their setting, rather than imposing on it. Nestled in Astruptunet, PAX Architects have composed a work that quietly celebrates art and nature, fashioning architecture into a lens through which to view the changing face of the fjords.

Explore a similar integration of nature and architecture with Studio Caraldo’s Jute Maze installation in Munich, promoting harmony with the environment.

Hallway inside PAX cave museum illuminated with soft lighting.
PAX cave museum
PAX cave museum structure with layered rock formations.
PAX cave museum
Exhibit space in PAX cave museum with modern installations.
PAX cave museum
Landscape view showing entrance to the underground museum.
Outdoor path leading to the entrance of PAX cave museum.
PAX cave museum
Exterior design of museum blending with natural rocky environment.
Open-air section of museum showcasing art against rocky backdrop.

Sources & Links

Source: designboom.com