Welcome to the Digital Archive of the Pietro d'Abano Thermal Study Center, a virtual space dedicated to the documentation, enhancement, and accessibility of the unique microbiodiversity of the Euganean thermal basin. The archive offers descriptive profiles and scientific insights on the area’s endemic cyanobacteria—exclusive microorganisms essential for the maturation of thermal mud—highlighting their role in the complex microbial ecosystems that characterize this extraordinary resource. This tool is intended not only for researchers but also for students, professionals, and citizens interested in discovering the invisible yet fascinating world of thermal mud. The project has been realized with the support of the Municipality of Montegrotto Terme.