There is this Dutch-Polish church at the Beukelsdijk, just outside the center.
Now where most Roman catholic churches in the Netherlands have trouble keeping a church visiting congregation, this church is full every Sunday morning.
At least according to the trouble we have in finding a parking spot on Sunday between 12 and 1.

After Poland has joined the European Union and especially for those Polish that hold a German passport and therefore are free to work here without any permit, the Polish carpenter or plumber has become a standard for cheap and hardworking labor.
Contrary to other immigrant groups who have been here way longer and still don't seem to be accepted, the Polish seem to have found their way around.