C. The people in hell can be seen for all eternity somewhere outside
of New Jerusalem.
And they shall go forth, and look upon the carcases of the men
that have transgressed against me: for their worm shall not die, neither
shall their fire be quenched; and they shall be an abhorring unto
all flesh (Isaiah 66:24).
D. The lake of fire
After the Great White Throne judgment, death and hell will be cast
into the lake of fire. This apparently is what can be seen from the
entrance to New Jerusalem. It is a physical lake of burning fire that
will exist on the new Earth.
Revelation 19:20; 20:10, 1415; 21:8; Isaiah 66:24