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).