There are 3 heavens mentioned in the Bible. The first heaven is the the atmosphere. The second heaven is outer space. The third heaven is the one where God lives. It's where Christians go when they die. It's where the angels live. I believe there are cities there, buildings, streets, walls, it is a real place.

Eternal life only comes through placing your FAITH in Jesus Christ, believing in your heart that He died on the cross, shed His blood for your sins and rose again from the dead.