Once the largest coal mine in Europe, the Zollverein complex in Essen, Germany, has undergone a remarkable transformation over the past twenty-five years. What was once a landscape of abandoned industrial facilities is now a laboratory of contemporary architecture, featuring works by Rem Koolhaas, Norman Foster, and SANAA. Their interventions bridge the site’s industrial past with its imagined future. Spanning 100 hectares, the UNESCO World Heritage site has become a global model of adaptive reuse, redefining what it means to preserve industrial heritage. Within this context stands the Ruhr Museum and its enigmatic art repository, the Schaudepot. Located in the complex’s former salt factory, the museum impresses not only with its collection but also with its architecture, which transforms a 1960s industrial building into a vibrant cultural venue.
Because of its historical and architectural relevance, the project is featured in the 2025 edition of Open House Essen, under the theme “Future Heritage.” The initiative explores which spaces might shape our future architectural legacy and asks pressing questions: What should we preserve? What should we adapt? And how can we design a future that is both livable and fair?
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Meeting House Square, Temple Bar. Image Courtesy of Sean Harrington Architects
The veteran Irish architecture critic Shane O'Toole once remarked that when traveling in Europe in the 1970s, "The universal comment was is there modern architecture in Ireland? Now, in less than 50 years, we've gone to a Pritzker Prize and two RIBA Royal Gold Medallists in five years." He attributes this change in perception to a design competition that launched the careers of several of Ireland's award-winning architects of today. This was the Temple Bar Framework Plan competition of 1991 in the center of Dublin, the capital of Ireland, which was won by a group of architects still in their 30s, running under the name of Group 91.
Opened in October 2024, the Järva Cemetery offers everyone, regardless of faith or beliefs, a space for remembrance, continuing Stockholm's long tradition of funeral history. After overcoming significant planning obstacles, the site, designed by Kristine Jensen Tegnestue and Poul Ingemann, was created to accommodate burials and funeral ceremonies, with options for coffins, urns, ash groves, and a commemorative forest. During the last edition of Open House Stockholm, visitors could explore its surrounding natural landscapes and connect with the space.
Throughout 2024, ArchDaily, in collaboration with the Open House Europe architecture event, brought inspiring projects and stories to light. These true architectural gems were unveiled through visits, and their widely shared narratives enriched the architectural discourse. It is an invitation to explore the stories behind buildings that, although part of citizens' daily lives, often go unnoticed amidst the routine automation of everyday life.
These narratives explored projects of different scales, uses, and contexts, revealing everything from religious buildings, to remarkable examples of adaptive reuse of old industrial structures, now taking on new roles within their communities. Each story uncovered the many layers that make up a building – from its initial design to the new meanings it has acquired over time.
In the heart of Tallinn, where history weaves through cobblestone streets and ancient towers, stands the Ungern-Sternberg Palace — a monument that bridges the opulent past of Estonia's aristocracy with the vibrant world of contemporary academia. Now home to the Estonian Academy of Sciences, this historic building embodies Estonia's enduring dedication to knowledge and cultural preservation. Through Open House Tallinn, which highlights the city's architectural heritage, the palace's significant history, and remarkable architectural details are brought to a wider audience, offering unique insight into Estonia's cultural resilience.
Constructed in the 19th century as a symbol of aristocratic power, the palace has transformed from a private residence into a national hub of intellectual life. Its grand halls, once the scene of lavish gatherings, now foster scientific and academic pursuits, illustrating how heritage architecture can evolve alongside societal change.
Standing out among the array of cultural programs, the opera and theater typology is often understood as encompassing the luxurious and elitist spirit of a bourgeois society focused on entertainment. Across the Soviet Union, this represented the opposite of the principles to be promoted. However, despite the opposition of the political class, the program remained widely popular. As the historical structures, symbols of the previous regime could no longer be promoted, the search began for a new image of the Opera House, one aligned with Socialist ideals and the concept of "art belonging to the masses."
This is the case of Soviet Lithuania, which, in the 1940s, began the process of developing a new Opera and Ballet Theater in Vilnius to replace the theatre in Pohulianka. The process resulted in an unusual commission, as young architect Elena Nijolė Bučiūtė won the 1960s competition for architectural design, turning the initial socialist realist proposals into a welcoming and expressive design, blending elements of early and late modernism. This also represents a surprising accomplishment for a young architect who was a woman and not a member of the Communist Party. Open House Vilnius featured the project in its program for several editions.
From 1977 to 1983, the National Theatre in Prague underwent a major transformation with the opening of Nová Scéna, a modern counterpart to the traditional Neo-Renaissance theatre. For many years, Nová Scéna hosted the renowned Laterna Magika, the world’s first multimedia theatre. This groundbreaking performance style combined classical theatre with computer-generated visual effects, creating a unique dramatic experience. The striking glass building, a symbol of the communist era, became an iconic representation of the political power of the time. In recognition of its significance, this building was part of the Open House Prague festival in 2024—an annual event that invites the public to explore and appreciate the value of architecture.
As a landmark of contemporary religious architecture in Portugal, the Church of the Sacred Heart of Jesus stands in contrast to traditional models, representing a work free from historicist stigmas. Resulting from a design competition organized in 1960, the church is notable for its civic dimension, urban role, and its anti-monumental and social significance. Integrated into the regular grid of the Avenidas Novas neighborhood, this example of the Movement for the Renewal of Sacred Art is part of a larger parish complex that often goes unnoticed by passersby. Its external street creates an unexpected public space, inviting people to enter and engage in a courtyard where architecture and the city merge. Finely crafted in terms of spatiality, detail, and light, the church holds many surprises for those who venture inside.
The landmark of Piraeus, located in the heart of the largest passenger port in Europe, began construction in 1972 but remained unfinished and vacant for decades. Finally completed in 2023, after an international competition, it now stands as Greece's first green and digital skyscraper. The architectural firm PILA took on the design of the facades, while the office ASPA-KST designed the commercial spaces, and the new general architectural study was entrusted to Betaplan. After over four years of renovation, Piraeus Tower officially opened its doors to tenants and visitors on June 4th with a night of celebrations, establishing itself as a bustling hub and injecting vitality into the area.
In response to the Czech Republic's soaring real estate prices, architecture firm KOGAA has transformed a former storage facility in Brno into DADA Distrikt, an affordable and diverse housing development. The project's economic approach, achieved through shared funding and direct sales, bypasses extra costs associated with developers while refurbishing a part of the city’s industrial heritage, transforming it into an active urban district. The project also features sustainability measures aimed at lowering its maintenance costs, further exemplifying the intersection of affordable housing, heritage restoration, and sustainable urban living.
The project is now part of Open House Brno, a free weekend festival held annually that allows visitors to enter and explore various locations across the city and discover their stories and architectural narratives. This year, the festival follows the curatorial concept of “Inclusion and Accessibility”, showcasing barrier-free integration of urban locations and the societal impact of buildings. A total of 58 locations will be available to visitors, exploring a variety of programs and scales demonstrating
Republic Square in Ljubljana holds immense historical and symbolic significance for Slovenia. It is located in the historic center of the city and features a blend of buildings with different designs, scales, and dimensions, together with interconnected open spaces, passages, and underpasses. These elements form a multifunctional complex whose construction lasted more than 20 years and underwent several volumetric and programmatic reconfigurations. Visible from a distance and standing out above the Ursuline Church’s bell tower, two prominent office towers rise as part of this work designed by Edvard Ravnikar, the most prominent Slovenian architect of the second half of the 20th century.
