The Greek official religion is called Greek Orthodox.  All over Greece are churches.  Here is a picture of a large cathedral in Nauplion.  It is cathedral dedicated to St. George. 

Here is a smaller town church -- this one in Nemea. 

There are many very small churches all over Greece -- just about the size of a large closet.  Here is one from a cave in a mountain near Nemea. 

Also, there are little shrines along roads.  People leave gifts to a saint in them, like candles, oil, or wine.  Here is one to St. George.

Almost every hour in Greece the church bells ring loudly.