What are the religious places where people worship?
They include churches, synagogues, temples, shrines, mosques, tabernacles, etc.
Can greek orthodox marry Coptic orthodox if so what is involved?
Since 1981 theologians from the Coptic and Orthodox churches have been meeting to resolve differences, and have concluded that many of the differences are caused by the two groups using different terminology to describe the same thing.
In the summer of 2001, the Coptic Orthodox and Greek Orthodox Patriarchates of Alexandria agreed to recognize the sacrament of marriage (and baptisms) of one another.