CEMENTLAND ARCHIVE is a growing collection of interviews, photographs, and other materials documenting an iconic industrial ruin in St. Louis, MO. In the 2000s, the St. Louis artist Bob Cassilly, known for the City Museum, set out to convert the abandoned Missouri Portland Cement factory into Cementland: part amusement park, part sculptural installation, part earthwork. The project stalled in the 2010s after Cassilly passed, but the site remained a wild patch of biodiversity and a popular hangout even as the property changed hands. We hope this archive will serve nuanced discussion of Cementland’s impact as a de facto active public art site that drew many curious visitors.