There are rocks inside
Bolczów Castle with
at least one route rated UIAA VI that used to be climbed. Now climbing inside the castle walls is not allowed, but
here is a photo of Krzysztof Kończakowski (
KRZYS on SP) on a VI.2 route. (
Sadly, KRZYS died at the age of 21 while climbing in the High Tatras on 31 December 2014.)