spectacular and shocking tunnel project of taroko national park

formation cave tunnel infrastructure arch geology rock caving terrain wall ruins wadi darkness stalagmite canyon soil spectacular shocking taroko national park yanzikou xiulin hualien taiwan rocky nature natural mountain hill magnificent grand vast extensive expansive scenery scene spectacle view sight landscape nopeople stunning charming beautiful powerful amazing dazzling picturesque breathtaking glamorous epic black grey brown tranquil peaceful serenity serene quiet journey tour tourism trave slate flagstone slab architecture structure civil engineering bedrock marble pristine dugout slate flagstone slab