Fortress and swimming pool in Třesice

Near Kosice and Kosiček, there used to be a village with a fortress (in 1315, according to additions to Dalimil's chronicle, there should have been Věněk from Třesic and Rudolf from Kosice, who were supposed to have killed each other's sons as part of many disputes) and at least a couple of courtyards. According to folk tradition, it was named after the fact that there used to be waterlogged places that were overgrown with a large amount of reeds and that "trembled" in the wind. With another theory…