A Couple of Things
The Dukla Pass (Road 73, E371) from Svidnik to the Polish border was part of the Eastern Front in WW1 and was the route the Russians used to liberate Czechoslovakia in WW2. There's a memorial and museum at the top with evidence of the trenches from WW1. All along the pass are pedestals at the side of the road mounted with military equipment from WW2, tanks, planes, guns, etc.
On a livelier note there's a really good biker rally in Stara Tura at the start of July, Tanec Slnka (the Sun Dance) is held by CMC Indians. Beware if you go you wont get any sleep, Slovakians know how to enjoy themselves!