I am living in Poland and my visa is valid until June 2014.
So can I go and visit other European countries or I can only visit Poland cities?
You don' mention what Visa you currently have. Let's asume however that you have a Polish Visa (If you had a Schengen Visa you wouldn't be asking this question).
Persons in possession of some national Visa of a Schengen country have travel rights in the whole of the Schengen area as if they had a Schengen visa. That means that the 90 days in 180 rule applies. At least officially.
In practice, since there are no immigration controls between the different states within Schengen you can mostly ignore these rules. I you want to travel to another Schengen country, just do so.
If you have a Schengen visa, you can only visit countries in the Schengen zone (like Germany and Spain, but not England). More information here: http://www.workpermit.com/germany/schengen_visa.htm