The unique Alloa Glasshouse Cone, constructed around 1824 and standing about 20m high, is the oldest surviving glass house cone in Scotland and the only one in Europe in a continuously working glassworks. The arched openings in the octagonal stone base originally led to adjoining workshops and furnaces while archaeological remains of the annealing furnace are still buried beneath the cone. Our conservation audit included archival research and a structural assessment, and identified a number of urgent repairs to preserve this important industrial monument. We suggested a new stustainable use for it as the focal point of a centre for interpreting the history of glassmaking and related industries in Scotland.