People walking around Stefanos crater moonlike landscape, Nisyros Island, Dodecanese Islands, Greek Islands, Greece, Europe

stefanos crater nisyros island moonlike landscape dodecanese islands greece europe hiking exploration geologic formations tourists nature scenery volcanic landscape earth colors outdoor activity travel adventure geology unique terrain visitors rugged land summer day patterns natural wonders thermal activity volcanic crater scenic view geological features island exploration breathtaking views earth science walking culture history travel destination geological park ecology environmental study thermal springs terrain diversity sightseeing relaxing open space natural beauty outdoor adventure historic site unique experience landscape tour