Jerusualam
Most say it's Jerusalem in Christianity, and some say it's the Holiest city for Islam and Judaism as well.
Jerusalem is considered the holiest city not only in Judaism and Christianity but also in Islam. It is believed that prophet Solomon built his temple (that was destroyed later on by the Romans) in Jerusalem. However, the city of Jerusalem is also central to Christianity where prophet Jesus was living. It is also central for Muslims as it was the first direction that they face during prayers and prophet Muhammad was raised to the Heavens (during the miracle of Israa and Mii'raaj) from Al-Masjid Al-Aqsa located in Jerusalem and returned back on the same night.
mecca
The holiest city for the Muslims is Makka (Mecca) situated in Saudi Arabia.
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.
madina
vatican city
Jerusalem.
The holiest city for the Muslims is Makkah(Mecca),S.Arabia
Jereusalem where Christ died and rose again (see Gospels).
mecca in saudi arabia allahuakbar
Jerusalem (Al-Quds).