strangely formed speleothems at the end of a dark gallery

alum angle attraction cave cavern chamber colorful dark destination dripping elf end fairy famous fantasy feengrotten formed gallery geology germany grotto grottoes horizontal idyllic indoors interior iron lake landscape low mine mineral people picturesque place pond reflection saalfeld satin scenic sightseeing speleology speleothems stalactite stalagmite strangely subterranean thuringia tourism tranquil travel underground view water