The average thickness of the walls of the Bydlin Castle was a bit more than 2 m and their average height was about 7 m. In the walls, there are traces of walled over embrasures. Apart from the defensive role, the Castle performed religious functions. At the end of the 16^th and the beginning of the 17^th century, Mikołaj Firlej, the Kraków Province Governor, rebuilt the castle as the Church of the Holy Cross. Burned by the Swedes in 1655, rebuilt and abandoned since the 18^th century, the church remains dilapidated. The ruins of the castle are available to visitors. The slopes of the hill feature the outlines of trenches that attest to the fighting in 1914. At the beginning of WWI, on 17 and 18 November, approx. 1,400 soldiers from the 6^th Battalion of the First Brigade of Józef Piłsudski's Polish Legions, along with Austro-Hungarian units, waged a heavy yet victorious battle with the Russian army near Bydlin and Krzywopłoty. Forty-six Legion soldiers died; they were buried at the local cemetery next to other fallen soldiers. The 18^th century stone chapel of the Consolation of the Blessed Virgin Mary, which originally functioned as a hermitage, located at the entrance to the old cemetery, deserves attention.

The village of Bydlin is located approximately 10 kilometres from Olkusz.