Nahdlatul Ulama -- the Awakening of Islamic Scholars -- was founded in Surabaya in 1926 by KH. Hasyim Asy'ari, a religious scholar who saw the need for traditional Islamic institutions to organize in the face of modernist reform movements sweeping the Muslim world. What began as a gathering of ulama, or religious scholars, in East Java grew into something far larger than its founders could have imagined. Today, Nahdlatul Ulama claims a membership exceeding 90 million people, making it not only the largest Islamic organization in the world but one of the largest civil society organizations of any kind. Its influence extends through a vast network of pesantren -- Islamic boarding schools -- hospitals, universities, and community organizations that touch nearly every aspect of life in Indonesia.

The museum's ground floor holds the paper trail of a century-long movement: historical documents, the NU coat of arms, records of Nahdlatut Tujjar -- the organization's early economic wing -- and proceedings from the leadership of KH. Hasyim Asy'ari himself. Among the more striking artifacts is a piece of the Kiswa, the black silk cloth that drapes the Kaaba in Mecca, a gift that speaks to NU's deep connections within the broader Islamic world. Upstairs, the collection shifts from documents to objects. Keris daggers belonging to NU's founding figures share display cases with photographs chronicling the organization's evolution across decades of Indonesian history -- from colonial resistance through Japanese occupation, independence, authoritarian rule, and democratic reform.

What makes NU remarkable in global terms is its theological posture. In a century when political Islam has often been defined by its most rigid voices, Nahdlatul Ulama has consistently advocated for a pluralistic vision of Islam that accommodates Indonesia's extraordinary diversity. The organization played a crucial role in shaping the Indonesian state's founding philosophy of Pancasila, which establishes belief in God without mandating any particular religion. This was not an abstract intellectual exercise. NU leaders navigated the violence of the 1965 anti-communist purges, the constraints of Suharto's New Order regime, and the turbulence of reformasi -- the democratic transition of the late 1990s. Through it all, the organization maintained its network of pesantren and social institutions, preserving a tradition of Islamic scholarship rooted in local practice rather than imported ideology.

The museum's inauguration by Abdurrahman Wahid -- universally known as Gus Dur -- carried layers of meaning that extended well beyond a ribbon-cutting ceremony. Wahid was the grandson of NU's founder and had served as the organization's chairman before becoming Indonesia's fourth president in 1999. His presidency was turbulent and brief, ending in impeachment in 2001, but his commitment to pluralism, religious tolerance, and democratic reform left a lasting mark on Indonesian politics. By opening the museum three years after leaving office, Wahid was affirming the continuity of a tradition that predated the Indonesian republic itself. KH. M. Sahal Mahfudh, then serving as Ra'is Aam -- the organization's supreme religious authority -- joined the inauguration, linking the museum's founding to NU's ongoing institutional life.

The museum sits in Surabaya's urban fabric without fanfare, easy to walk past if you are not looking for it. This modesty feels appropriate for an organization that has always operated more through networks of personal relationships and local institutions than through grand gestures. Visitors who do find their way inside encounter something rare: a window into a tradition of Islamic thought that defies the simplistic narratives often applied to the Muslim world from the outside. The keris daggers, the conference photographs, the handwritten documents of NU's founding scholars -- these are not relics of a distant past. They are artifacts of a movement that remains one of the most powerful forces in Indonesian civic life, shaping education, politics, and religious practice for tens of millions of people.