While Jericho represents a place of destruction, it also stands for the place of opportunity. Think of Rahab, the harlot who hid the two Israelite spies on her roof and saved herself and her family. She put the scarlet thread (which represented the blood of Christ) in her window (Joshua 2:18). Everyone except for Rahab and her family died in Jericho.
The priests and the people of Israel walked around the city of Jericho once each day for six days, carrying the Ark. The people were told to be silent as they walked. But on the seventh day, they were to walk around the city seven times and on the seventh time, they were told to shout at the sound of the priest's trumpets, and the walls would come down.
It is sad when people don't get redeemed at their Jericho, but continue in self-destructive patterns. God is not willing that any should perish. Yet, because God cannot look upon sin, those living in such patterns live in Adam, who has already been condemned, just as Jericho was condemned. Jericho was given to Israel by faith. This means that God, through Christ's death, burial, and resurrection, gives us the victory over what has been condemned to the grave. It is not by our works that we overcome! It is a gift of grace.