The ruins of the castle of the Masovian princes in Czersk (Polish: Zamek książąt mazowieckich w Czersku), or Czersk Castle for short, are located in Czersk in the Piaseczyński district …
A perfectly renovated bunker that you can enter with a bit of luck. It is worth having some small with you to support the activities of enthusiasts thanks to whom this unique attraction exists.
Quiet road, extremely popular with locals hence a bit crowded at weekends but the sparse traffic makes it all right between cyclists. Tarmac quality varies from decent to excellent.