Most say it's Jerusalem in Christianity, and some say it's the Holiest city for Islam and Judaism as well.
Jerusalem would probably rank as the holiest city to Christians (as well as Jes and Moslems). It was in, or near, Jesrusalem where Christ was born and died.
heaven
One of the holiest of cities for Christians is the city of Jerusalem. Bethlehem is another holy city for Christians.
mecca
Jerusualam
The holiest city for the Muslims is Makka (Mecca) situated in Saudi Arabia.
Unlike Judaism (Jerusalem) or Islam (Mecca), there is no "holiest place of worship for Christians."
madina
vatican city
Jerusalem.
The holiest city for the Muslims is Makkah(Mecca),S.Arabia
mecca in saudi arabia allahuakbar