Jerusalem. It is God's city - earth central.
It is believed by many biblical students, that God created Adam from the red clay in Salem (Hebrew means 'peace') and then transported him into the Garden called Eden.
Paul in Hebrews 5 thru 7 explains how the King of Salem, Melchizedek, is one and the same as Jesus.
God will purge the earth clean via fire (see 2 Peter 3:10-13) and the Father will descend from Heaven above and bring a 'New Jerusalem' with and for Him and His Son, Jesus, to be a family with the new children of God (see 2 Corinthians 6:18, etals).
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.
One of the holiest of cities for Christians is the city of Jerusalem. Bethlehem is another holy city for Christians.
Unlike Judaism (Jerusalem) or Islam (Mecca), there is no "holiest place of worship for Christians."
mecca
Jerusualam
The holiest city for the Muslims is Makka (Mecca) situated in Saudi Arabia.
Most say it's Jerusalem in Christianity, and some say it's the Holiest city for Islam and Judaism as well.
Easter is the day Christians observe the resurrection of Jesus.
madina
vatican city
Jerusalem.
The holiest city for the Muslims is Makkah(Mecca),S.Arabia