kaiserhalle of the dechen cave in iserlohn, the most beautiful stalactite cave in germany

darkness cave painting formation screenshot art night light caving tunnel geology mythology person terrain rock poster reflection kaiserhalle dechen iserlohn most beautiful stalactite germany its stalagmites stalactites dripstone cave kaiserhalle stalagmites stalactites iserlohn sauerland germany rock nature light underground geology stalactite wall stalagmite mountain water limestone tourism inside adventure tourist attraction beautiful mystical