the entrance to the cave is secured against the entry of unauthorized persons.

wall rock ruins tree arch geology terrain formation plant wood iron cliff flower temple trunk building architecture fortification art entrance cave secured entry unauthorized persons important karst area czech republic moravian paleontology sites tourist archeology bedrock cavern conservation country countryside ecology excavations excursion flora forest grotto history landscape limestone moravia nature outdoors outing portal region speleology stalactite sunshine tour tourism trip bars grille rating security safety barrier inhibition disincentive lock