Kláštorská Gorge is located in National Park Slovak Paradise and despite it's shorter length, it's quite steep. It's a one-way trail and leads through beautiful nature and you will encounter numerous waterfalls on your way. There are ladders and chains to help you with your ascent.
Wikipedia (Czech) https://cs.wikipedia.org/wiki/Kl%C3%A1%C5%A1torsk%C3%A1_roklina
Address 05313, Slovakia
Coordinates 48°57'10.382" N 20°25'23.03" E