Believed to be the highest waterfall in the world in the 18th century (Angel Falls in Venezuela now has that claim), the 104m-high Rjukanfossen is still a spectacular sight, even if most of the water has been diverted to drive the Vemork power station. To get the best view, take the Rv37 heading west and park just before the tunnel 9.5km west of town; a 200m walk leads to a fine viewpoint.