Citizen observatories provide an innovative learning environment by allowing participation in scientific research projects. One example is the CITCLOPS project, which designed the KdUINO buoy for measuring water quality through citizen science. The buoy uses open hardware and software, allowing makers to modify it and observers to collect data accessible to all. Citizen observatories offer roles for makers, observers, and analyzers and provide learning through research, cooperation, technology, and sustainability education. Challenges include careful activity design, teacher training, flexible school organization, cooperation, and resources.