Ojcow National Park is located not far from Krakow. It takes only 30 minutes to get there by public transport. This park is well-known for its natural attractions as well as its numerous castles.
For example, the ruined Gothic castle or a better-preserved Renaissance castle at Pieskowa Skała. Both of these castles were part of a late-medieval defensive system of southwestern Poland.
This system is known as the Trail of the Eagles' Nests. The best time to hike in the park is the warm season, but if you don't mind the cold you can try it during the low season when the park is almost empty.