The article was written by Arek Kaminski, a young polish climber and devoted visitor of Pertohrad bouldering area and all photos were taken by Jiří Sika (JirkaS).
The article is quite long and offers full description of the area accompanied by hi resolution pictures.
Petrohrad - Boulder Paradise
Text: Arkadiusz Kamiński a Jiří Sika
Pictures: Jiří Sika
Link to polish climbing web page Wspinanie.pl
Link to nice website maintained by the author of the article La Roca