The ladder was built so that salmon can travel upstream during the breeding. It turned into a popular tourist attraction. Also, it's a popular area for a walk.
More information http://www.highlandperthshire.com/regions/pitlochry/pitlochry-dam-and-fish-ladder.aspx
Address Port-na-Craig Road, PH16 5, United Kingdom
Coordinates 56°41'55.646" N -3°44'21.19" E