Travelling means going or being transported from place to place.
Sight-Seeing is the activity of visiting places of interest in a particular location.
Most times, sight-Seeing will only take place by travelling down to the place of interest especially when one has been to the places of interest near to one already.
Apart from being a means of catching fun and exploring new places one has never been to, travelling is a means of gaining bebeficial knowledge about people, places, culture and many more. it makes one appreciate nature and other environments that are existing far away from what one is used to.