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path mountain rocks grass flowers pink green sky clouds sun nature landscape scenery beautiful amazing stunning breathtaking picturesque idyllic serene tranquil peaceful calm relaxing soothing restful peaceful quiet still serene tranquil calm relaxing soothing restful pathway trail walkway footpath bridle path hiking trail nature trail scenic trail tourist trail pilgrimage trail trade route silk road incense route spice route gold route silver route copper route tin route lead route iron route coal route oil route gas route electricity route water route canal route river route lake route sea route ocean route air route space route