Ostrava Seismic Station.

     The article could also be called:
 
     "How, purely by chance, while walking through the unusual Ostrava still life, I "discovered" a seismic tunnel."
 
     But everything is fine. One frosty Christmas day, or rather late afternoon, I went to already known places for the Ostrava observatory and planetarium named after Palis, a native of Opava. The observatory itself has a building for visitors…