hidden air raid shelters and trench tunnels in bitang natural ecological park

addition air aquatic autumn biological bitang cones construction deciduous destroy diverse dragonflies ducks ecological ecology egrets elevated encounters expect facilities filled fire flower forest frogs full function functions grass grassland green habitats hidden hornwort hydrant irrigation jungle landscape landscaped leaf lilac lotus natural nature park pavilions piers pinaceae pine place plant plants platforms pond ponds raid retains revetments seasons shelters shrubs storage sunlight surprise taiwanese tall trails travelers tree trees trench tunnels vitality water waterfront waterweed wetland wild wilderness woodland