Pope Benedict XVI wrote:
Let us return once more to the night of Holy Saturday. In the Creed we say about Christ’s journey that he “descended into hell.” What happened then? Since we have no knowledge of the world of death, we can only imagine his triumph over death with the help of images which remain very inadequate. Yet, inadequate as they are, they can help us to understand something of the mystery. The liturgy applies to Jesus’ descent into the night of death the words of
Psalm 23[24]:
“Lift up your heads, O gates; be lifted up, O ancient doors!”
The gates of death are closed, no one can return from there. There is no key for those iron doors. But Christ has the key. His Cross opens wide the gates of death, the stern doors. They are barred no longer. His Cross, his radical love, is the key that opens them. The love of the One who, though God, became man in order to die – this love has the power to open those doors. This love is stronger than death.
vatican.va/holy_father/benedict_xvi/homilies/2007/documents/hf_ben-xvi_hom_20070407_veglia-pasquale_en.html
Baltimore Catechism No. 3 - on the states of Hell, Purgatory, and Heaven
Q. 1379. What is Hell?
A. Hell is a state to which the wicked are condemned, and in which they are deprived of the sight of God for all eternity, and are in dreadful torments.
Q. 1380. Will the damned suffer in both mind and body?
A. The damned will suffer in both mind and body, because both mind and body had a share in their sins. The mind suffers the “pain of loss” in which it is tortured by the thought of having lost God forever, and the body suffers the “pain of sense” by which it is tortured in all its members and senses.
Q. 1381. What is Purgatory?
A. Purgatory is the state in which those suffer for a time who die guilty of venial sins, or without having satisfied for the punishment due to their sins.
Q. 1382. Why is this state called Purgatory?
A. This state is called Purgatory because in it the souls are purged or purified from all their stains; and it is not, therefore, a permanent or lasting state for the soul.
Q. 1395. What is Heaven?
A. Heaven is the state of everlasting life in which we see God face to face, are made like unto Him in glory, and enjoy eternal happiness.
Q. 1396. In what does the happiness in heaven consist?
A. The happiness in heaven consists in seeing the beauty of God, in knowing Him as He is, and in having every desire fully satisfied.
When our bodies are re-united with souls:
Q. 1390. Will our bodies share in the reward or punishment of our souls?
A. Our bodies will share in the reward or punishment of our souls, because through the resurrection they will again be united to them.