Adršpach is a set of sandstone formations located near the border with Poland in the northern part of the Czech Republic. There are three trails of varying difficulty and length, where you can enjoy beautiful rocks (e.g. lovers, a turtle, etc.), climb various staircases carved into rocks, squeeze through narrow corridors (the narrowest is just 50cm wide!) and stare at gorgeous lakes/waterfalls.
You may also want to check out the somewhat related galleries: Plzeň (European Capital of Culture 2015), Karlovy Vary (incl. Grandhotel Pupp which was featured in Casino Royale) and Delicious Delicacies, Plzeň (your culinary guide to Plzeň).