Stone monuments and abandoned quarries –ways of restoration in Germany through times

Restoration of stone monuments in Germany faces significant challenges due to the closure of original quarries, leaving no suitable substitute materials. This study examines six iconic structures—Cologne Cathedral, Freiburg Münster, the Stone Bridge in Regensburg, Kaiser-Wilhelm-Monument at Porta Westphalica, Old National Gallery in Berlin, and the Picture Gallery of Sanssouci Palace in Potsdam—to analyze how replacement stones were selected under varying economic and political conditions. Two cases involved temporarily reactivating old quarries, while others relied on alternative materials. Notably, one restoration was reversed when the original stone became available again. The research highlights the decision-making processes, trade-offs, and lessons learned from these approaches, offering insights into sustainable heritage conservation strategies.

Ehling, A., & Ebel, R. (2026). Stone monuments and abandoned quarries –ways of restoration in Germany through times. Boletín Geológico Y Minero, 137(1), 8. https://doi.org/10.21701/bolgeomin/137.1/008